Piranha

Though there are plenty of references to giant piranha here, you hardly ever see them and when you do, they're of normal size.

They do however make bird noises every time you see them. Really. They combine loud bird screeches and parrot calls and that's just the noise the fish are shown to make... it's ridiculous.

There are a few little dialog gems though, so it does get a little credit for that.

"The fish, sir! They're eating the guests, sir!"