I heard chimpanzees are 3 times as strong as a man and could rip your arms off!
http://www.straightdope.com/classics/a1_001b.html
lol, I know. Hence why I haven't actually done it

Yeah I remember someone posting a news story here a while ago about a guy that fell into a chimpanzee inclosure or something and got attacked. Apparently they ripped half his face off, tore off his genitals and one of his arms or something. Unbelieveable.