Bottomless Pit

Okay, here's something I've seen in several movies that really bugs me. Let's start with Jurassic Park. All right. I'm not saying that a dinosaur wouldn't try to eat a tasty human (the big jerks taste the best-too bad they didn't get that weird chaos theory guy Malcolm I think his name is). But there's one part of a movie, I think the third movie, where the T-rex (or maybe it was the spinosaurus? Don't remember) has a kill and then it looks up and sees the humans. And it starts chasing after the humans. COME ON. The t-rex already has a huge dead dinosaur to eat. It's not going to go chasing some shrimpy little humans. Animals don't kill for fun.
And Tremors. The graboids, ex, keep killing and eating more people. They NEVER get full. After swallowing one human, they'd be plenty full for a while and they'd want to go digest somewhere. They wouldn't go on trying to eat the whole town all at once. Like snakes. Snakes (little ones) eat about once a week. And the big ones eat even less. I heard about one big snake in a zoo or something that only ate once in a YEAR. Of course some of those big snakes can even eat a deer. But I digress. Either way, graboids wouldn't go on eating all the humans until they burst. That's just weird.
Oh, and in the new King Kong movie (I don't recommend this movie quite as highly as I recommend the two proceeding movies but there are some cool parts) does something else. There's a T-rex on that bizarro island where the big gorilla guy lives. And it seems like that T-rex will stop at NOTHING to eat the poor girl what's-her-name. Even when they're dangling from vines and hanging over a huge crevasse, that T-Rex is still trying to chomp the girl. If the T-rex is hanging over the edge of a cliff and tangled in vines, he'd have more important things on his mind than eating a tiny little thing like a human girl.
COME ON PEOPLE! Stop doing this to your stupid dinosaurs and monsters. They aren't bottomless pits, they don't kill for fun, and when they are about to fall over a cliff, they won't still be trying to eat.
HISSSSSSS!!!!!!!!