Battleduty Modernfield 3. It's a game, sort of, that you can play. Barely. It's also pretty damn great.
Taking the whole "trolling of copyright" thing on the iPhone to a hilarious new extreme, this parody title takes static screenshots of both Battlefield 3 and Modern Warfare 3, overlays a crummy gun and adds some "pew pew" effects. There's even some added art slipped into the extremities of the screen.
It's priced at $0.99. Totally not worth it as a game, but if you've paid that price or more for other joke apps, this is probably better.
Battle Duty: Modern Field 3 [Android Marketplace]