It's enough to make you never want to go swimming again - video has emerged of a piranha pack demolishing a bull's head in South America.
The speed of the destruction looks like something out of a cartoon, but the footage shot in the Amazon River in Peru is all too real.
A barefoot man can be seen holding the bull's head over the murky water as the deadly sea creatures show down, thrashing in the water all the while.
In less than a minute, only bone is left.
The video is believed to have originated from La Prensa Libre, a Costa Rican newspaper.