Return of the Jedi/Funny

Dude, there is nothing more funny than watching a bunch of Ewoks bowing to C-3P0. Except perhaps when the run away in fear of his "Magic".
When the gang is made "part of the tribe" one of the Ewoks gives Han a hug. Chewie gets multiple hugs, much to his dismay. Han tries to look on the bright side.

Han: Well, short help is better than no help at all.

Poor Threepo, no respect at all.

C-3PO: He says the scouts are going to show us the quickest way to the shield generator.
Han: Good. How far is it? Ask him.
3PO turns to ask, Han pulls him back
Han: We need some fresh supplies too.
3PO turns again; Han pulls him back again
Han: Try and get our weapons back.
and again
Han: Hurry up, will ya? Haven't got all day!

You can tell that Luke and Han don't think very highly of themselves when they talk like this.

Han: Together again, huh?
Luke: Wouldn't miss it.
Han: How we doin'?
Luke: Same as always.
Han: That bad, huh?

When the group is caught in an Ewok trap.

Han: Great Chewie! Great! Always thinking with your stomach!

Leia's friendship with Wicket the Ewok. Also a Crowning Moment of Heartwarming.
For some reason, Salacious Crumb the creepy-little monkey thing always gets a chuckle out of This Troper. Maybe it's because he looks and acts like a demented Muppet?
The Meaningful Echo / Call Back at the bunker, when Han sees that Leia is concealing a blaster:

Han: I love you.
Leia: I know.
Stormtrooper: Hands up! Stand up!
[Leia whirls around Han and shoots the stormtroopers]