LEGO Adaptation Game/Funny

Considering one of the main priorities of these games is to retell famous movies with Heroic Mimes in slapstick situations, you can expect a lot of these.

Star Wars

When Luke Skywalker first gets his lightsaber and waves it around, he ends up slicing C-3PO's head off. Like in the movie, though, Obi-Wan ducks.
Leia gives R2-D2 the Death Star plans by opening his head.
How is the greatest reveal in The Empire Strikes Back handled in the LEGO games? By having Vader pull out a family photo, and then saying to Luke (something sounding like) "Your pa".
And then there are the defective droids the Jawas attempt to sell, R2 falling off of Luke's speeder, Han shooting first and blowing out Greedo's entire torso in the process, Han's Paper-Thin Disguise, the Super Fun Happy Slide into the trash compactor, Obi-Wan waving to Luke while he's fighting Vader... and Vader waving as well, the Rebel pilots' reactions to the plan to destroy the Death Star, a TIE pilot almost shooting himself in the head, a Stormtrooper being thrown through space from the explosion of the Death Star... and this is only the cutscenes from a single section of the game.
Alderaan is destroyed, Leia breaks down crying, and Tarkin points and laughs at her.
Vader learns the importance of seatbelts at the end of A New Hope.
When you turn on the disguise bonus, all characters get Groucho Marx glasses and mustaches. Everyone. Even in cut scenes. Some pretty dramatic scenes in the original get very, very funny this way.
- Goes up a whole new level in cutscenes involving vehicles, especially whenever an AT-AT is involved.
During the Droid Factory level of The Clone Wars, Anakin's forces are being overrun and two new enemy tanks have just deployed. He tries to radio Ahsoka and Baris, but they're too busy gossiping. Anakin finally throws his radio down, runs up to one of the tanks and kicks it. He then starts hopping up and down, clutching his injured foot.
This musical tidbit, found in the Episode VI levels of Lego Star Wars: The Complete Saga, also arguably qualifies as a Crowning Moment of Awesome. One level takes place on Jabba the Hutt's sail barge, and another level, in Jabba's palace. In either level, there are a few places where one can assemble a radio (or speakers, on the barge). Once that's done, a rock remix of Imperial March begins playing. Awesome in and of itself, but where the funny comes in is that any Gammorean guards in the area who aren't being attacked will turn their battle-axes upside-down (wielding them like guitars) and proceed to headbang to the beat of the song.
The first cutscene in "Return of the Jedi." First we see the awesome visual of the Imperial Shuttle flying through space and landing in Death Star II's hangar. The guards are waiting. The door opens. There's smoke/steam everywhere...and Darth Vader is coughing and hacking through it. He pauses, regains his composure, and goes to one of his generals. We cut to a bunch of engineers literally slacking off (one spins in a chair!). DV shoots his general a dirty look and walks off. The general breaks down, and another one moves to console him.
Han Solo, frozen in carbonite, as a playable character. As if the idea weren't funny enough, the character's movement is what really sells it—the carbonite block sort of wobbles around.
The birth of Luke and Leia at the end of Revenge of the Sith is made hilarious by a) the two "popping" sounds as Padmé gives birth (off-screen), and b) the fact that baby Leia is sporting her famous hairstyle from A New Hope.

Indiana Jones

In one of the Last Crusade cutscenes, when Schneider attempts to get Indiana Jone's attention for the first time , she first jumps up and down waving. When he doesn't see her, she throws an orange at his head, and when he sees her, she walks towards him in slow-motion, flipping her hair in a suggestive way. And then Indy's eyes turn into hearts. This Troper just cracked up.
Indy offering Belloq the head of C-3PO, only to watch as Belloq imitates a robot in front of some natives.
In The Adventure Continues, the Thuggees have just stolen the village treasure, and take off by using a tree as a catapult, which is funny in itself. Then Indy, Willie and Short Round try to imitate the trick, WITH AN ELEPHANT! This does not work of course, and they jump off. The elephant goes orbital.
Another Last Crusade cutscene: Indy enters the Grail room, only to see a shadow shaped like Darth Vader. The shadow then lifts up the sword handle and a blade pops up similar to a lightsaber (with the same sound effects). Indy freaks out, only to cut to the Grail Knight laughing his ass off.

Batman

As seen in the DS version, there's a comedic "What the Hell, Hero?" moment when Robin laughs at two policemen frozen by Mr. Freeze. Batman's expression is priceless, and at the moment is the page image for the VG page for What The Hell Hero.
Batman using the Batcomputer to shop at "www.awesome-capes.com".
When the villains are playing poker, Killer Moth keeps getting distracted by the lamp near him.
One cutscene where Batman and Robin notice the Bat-Signal in the air. Batman tries to keep Robin from leaping off the top of the building, but Robin does so anyway and (presumably) eats pavement. Batman shrugs his shoulders then starts going down the fire escape.

Harry Potter

The part when Quirrel warns the great hall about a troll is priceless. Especially when a full scale riot happens once he's finished and Dumbledore has to duck to avoid getting hit by objects thrown by panicked students.
Ginny Weasley discovering that moving Riddle's diary makes Riddle himself move. She then proceeds to shake the diary, causing Riddle to go flying around the chamber, even repeatedly smacking it against her forehead, until Harry snatches the diary from her in irritation.
- Earlier on in the same story is the fact that Lucius Malfoy doesn't even try to hide the fact that he's slipped Tom Riddle's diary into Ginny's bag.
Earlier on in Chamber of Secrets, Harry and Ron ingest the polyjuice potion to get into the Slytherin common room. In the movie, they obviously morph into their counterparts. How is it handled in the game? They just have Crabbe and Goyle's hair balanced pathetically on their heads, providing the very definition of a paper-thin disguise. And despite this scene partially falling to the logic of the Lego universe, Hermione still turns into a cat. And can be unlocked as an optional playable character.
The way Quirrelmort trying to find unicorn blood is handled. First, there's a sick unicorn at Hagrid's house. He treats it exactly like a parent would treat a sick child - taking its temperature, making it lie in bed, etc. Then Malfoy is apparently fiddling with some jars outside Hagrid's house, and he's promptly sent flying into the pumpkin patch. Then the sick unicorn runs into the forest, and how is Quirrelmort trying to drink its blood portrayed? Voldemort himself creeps up on the unicorn, with a knife and fork. This troper cracked up.
- Hagrid's not only taking its temperature, he's got the thermometer in the wrong way!
After the first battle with Voldemort's ghost, Harry goes unconscious, leaving him vulnerable to Voldemort, who attempts to grab him...only to find out his hands go right through him. Harry's parents laugh through the Mirror as he does this.
After the first DADA lesson with Lockhart, you can go to the Hogwarts grounds to find him being chased by Fangirls.
The reason Voldemort killed Snape? He ate the last cookie!
- And he knew Voldemort wanted it.
The prophecy is portrayed as Harry and Voldemort fighting over a one-up heart.
In the movies and books, Umbridge is overwhelmed pretty quickly by the centaurs. In the game, she busts out some ninja flips. It's doubly funny if you're a fan of A Very Potter Musical.
In one segment, you can host a puppet show as part of a puzzle. If it's not a reference to Potter Puppet Pals, I don't know what is.
Harry's flashback near the beginning of the game to the events of Goblet of Fire feature a newspaper with a photo of the Triwizard cup with Cedric Diggory's parts stuffed in it.

Pirates of the Caribbean

Davy Jones' heart is depicted in LEGO Pirates as...a one-up heart wearing his hat. It looks really silly.
- On that note, Davy Jones' story is told through playing cards.
The backstory of the cursed Aztec gold that turned Barbossa's crew into skeletons is told with cardboard cutouts on sticks... which are also used for the loading screens.
Angelica slaps Jack Sparrow with the beard of her dead father.
Cutler Beckett's entry in the opening of Dead Man's Chest. When he and his men are sailing to Port Royal's shore in lifeboats, Beckett's horse is rowing the boat for him. Beckett then rides up to Elizabeth, dismounts...and we see that he's a midget.