Next is a fish, the piranha to be exact, I watch movies like everyone else and guys, piranhas are not vicious killing machines, that's a stereotype and a myth. Piranhas only frenzy when blood is in the water, just to prove my point, I stuck my hand in a tank full of red gilled piranha, they never bothered me, tried to avoid me in fact.
To further prove my point I found this video a guy jumping into a swimming pool full of them.
He looks fine to me :)
bottom line, if you don't jump into the water with a open and bleeding cut you'll be fine, if you do have an open cut, all I can say is I hope your life insurance is payed up.
Saying a piranha will kill without reason is the same as saying special forces or the SWAT team are just soulless killers and that's just mean, some of you who have met me, know for a fact this is a wrong assumption. Try and remember Hollywood has to make it look good, so you'll go watch it ^_^