10. Gremlins (Bright Light)
The Gremlins; little mischievous and murderous green creatures who start life as cute little furry animals called Mogwai. If you are responsible for a mogwai, there are three simple rules that you must adhere to; First of all, don't get them wet - it causes them great distress and causes them to multiply and not all of the creatures that spawn from it are particularly friendly. Second of all, don't feed them after midnight - that's what causes them to turn in to Gremlins in the first place. Thirdly, don't expose them to any kind of bright light - especially not sunlight, as that will kill them. The water and sunlight rules still apply after the transformation in to a Gremlin, so if you ever encounter one, just shine a torch in its face (or, if it's day time, just go outside). You win.