Creature Features

Having recently put myself ashamedly through not one but 2 films featuring a giant octopus followed by half of a film about a large spider which was about all I could bear, I call upon readers to consider any films about terrifying creatures that they might have seen, maybe, well.. large spiders in 'Eight Legged Freaks', or 'Arachnophobia', or maybe the old favourite killer shark in 'Jaws'? Let me know about your most dreaded movies right now!