If you loved Piranha, try Twilight Zone: The Movie
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Joe Dante, and they both carry the dread, late night mood tags, and they sit in Horror / Science Fiction territory. If that's the register that drew you to Piranha, the second film will land in a comparable space — through a different lens.
dreadlate night
What Twilight Zone: The Movie is
A suburban lawn, twilight, a rusted can underfoot. Three nightmares walk in—each a different shadow of fear. One leaves a door cracked for you to step through. John Landis and company drop the needle in the dark, letting the anthology's old terrors coil into new flesh.

