Incoming

A Stock Phrase where a character (often the Comic Relief) alerts the other character(s) of an "incoming" danger, often a large, falling object of some kind.

Expect an Oh Crap or two on the side.

This is Truth in Television as "Incoming!" is the traditional warning call for artillery shelling about to hit a unit's area. Since this is often the deadliest form of attack, the soldiers definitely have to find cover.

Not to be confused with the 1998 game of the same name by Rage Software.

Examples of Incoming include:

This Very Wiki

Incoming Ham

Film

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Cris Johnson: [knows he's about to be punched by Liz's stalker] Incoming. [gets punched in the face]

She's the Man

Toby: [cough] Incoming.
Viola: Check out the booty on that blondie.

The Santa Clause

Scott Calvin: Santa rolling down the block in a PANZER! Well, kids, I... I certainly hope you have been good this year, because it looks like Santa just took out the Pearson home. Incoming!

Transformers: The Movie (2007). A F-22 Raptor jet approaches.

Ironhide: INCOMING!

Transformers: Revenge of the Fallen (2009). Lennox and Sam are under attack by Mixmaster.

Jetfire: INCOMING!

Veggie Tales: King George and the Ducky

Junior Asparagus: Incoming! Boysenberry at 3 o'clock!

The Matrix Reloaded. When a Squiddy throws a bomb at Soren's ship, a crewman yells "Incoming!". It doesn't help.
Star Trek VI, when the Enterprise is getting walloped by Chang's BoP:

Chekov: Incoming!

Gnomeo and Juliet has an "incoming!" followed by a flying gnome who lands lands hat-side down and the hat's point sticks in the ground.
Stripes combines this with an Oh Crap, when a poorly aimed mortar shell comes in on where Sgt. Hulka is training the recruits.

Live Action TV

Midsomer Murders episode "The Green Man"

Daniel Webster: Trouble.
Cully Barnaby: What?
Daniel Webster: Incoming. My dynamic dad.

Mystery Science Theater 3000 - Catalina Caper

TV's Frank: Frank! Incoming!

Video Games

C: The Contra Adventure. Sometimes when you make Ray launch a bomb in the third-person view mission:

Ray: Incoming!

This is a voice command in Team Fortress 2 (humorous by the way the Heavy says it).
A Space Marine shouts this in the opening video of the original Dawn of War, just as a horde of Orks hits their position. As you may expect, it is as epic as it gets.
Ubiquitous in Call of Duty: Modern Warfare series, usually whenever an RPG is fired or a grenade, thrown.
Will occasionally be spoken by infantry who have been targeted by an impending artillery barrage in Company of Heroes, even before the player can see the shells. Usually followed by a frantic series of click-move-retreat commands.
Some of the earlier Worms games start with a worm yelling "Incoming!"

Western Animation

Transformers Animated episode "Transform and Roll Out!: Part One"

Optimus Prime: Would it kill you guys to say something like, "Watch out," or, I don't know, "Heads up," or...
Ratchet: Incoming!

Web Comics

Lenny does it at the end of a Sunday special in The Wotch. Of course, if you had read Accidental Centaurs before, you knew he would say that, since he crosses over both 'verses.