There's a famous quote said by the folks at Discovery Channel's Mythbusters, and that's "I reject your reality and substitute my own." Well, Hollywood's been doing that for years, and someone at Neatorama's compiled a short list of real physical effects that have been rejected by Hollywood and substituted with something meant for effect.

There are a couple of notable ones, though. The one about shotgun blasts and karate kicks causing people to fly away isn't possible, for example, because every action should have an equal and opposite reaction; therefore, if you kick someone in the face, they'll only fly back as far away as you get thrown back by the awesomeness of your kick.

There's also the one about exploding artillery shells. In that case, artillery shells don't simply blow upwards: they scatter shrapnel all around. The only reason why people in movies survive artillery fire is because the explosions are set below ground, keeping anything that looks like killer metal away from actors' faces.

Oh, and on that final note... No one is really supposed to hear you scream in space. There's no air, remember?