I think they did Mouse Trap. And actually Hungry Hungry Hippo has possibilities (though not with that name). They've made movies about vicious sharks, crocs, gators, snakes, rats, dogs, cats, apes, bees, ants, bats, spiders, pirahnnas... hippos are more dangerous than most of them, but aside from a cameo in Congo I've never seen them do anything but lay out on the beach or poke their head curiously out of the water.
Ants in the Pants also has possibilities, but that's a conversation for later :-)










Actually these titles sound better than many movies I've seen announced this year. You better get these outlined and sent or some studio exec will nab, erm I mean have a 'great idea'. Great movie posters too.