Heli Attack 2 is a game that on its own is pretty lame. Its main claim to fame is that the much more amusing, although equally crap game, ROFL Attack spawned from it.

Heli Attack 2 is a game where you are a pilot that has been shot down and you have to kill wave after wave of helicopters with your gun whilst dodging the bullets. You can also get a jet pack and fly around. I played Heli Attack 2 once and was bored pretty much just after I started playing. Maybe you will be more amused than I.