Deadliest catch? Piranha fishing!
This piranha bit into a chunk of raw beef and managed to get through a fair portion of it before being reeled in, photographed and let back in the water. This was in the Bolivian pampas, down the Andes from La Paz and past Rurrenabaque. I didn't set foot in that water.
Canon EOS Digital Rebel XTi with Canon EFS 17-55mm lens
1/160 sec, f/3.2, ISO 100