The following are some of the more classic piranha movies, as well as their synopses:

1. Piranha 3D (Piranha 3D): tells the story of a group of piranhas that begin to attack the people who come here to swim and play in a beautiful lake, triggering a bloody tragedy.

2. Deep Blue Sea: A group of scientists conduct genetic experiments in an undersea laboratory, which unexpectedly leads to a massive attack on humans by sharks with highly elevated intelligence.

3. Sharknado (The Meg): about a deep-sea diver's confrontation with a giant prehistoric shark, in order to save his colleagues trapped on the seabed, he must fight the beast to the death.

4. Jaws: A classic piranha movie about a small town attacked by a great white shark, where the local police and a marine biologist team up to fight the ferocious shark.

These movies are highly rated and watched, so if you like thrillers, try watching them.