So good, so painful. 

Note to self: Don’t go swimming in Brazil.

Joao Antonio Cruz Junior recently uploaded a video to YouTube of him feeding some piranhas in a river.

It looks pretty calm until he tosses in a hunk of meat, and then all hell breaks loose.

Watch as these water demons tear their food to shreds, and then never go anywhere near this place ever because they will ruthlessly kill you and gnaw on your bones.