Mark Allen Hicks' Nunchucks

Origin
Afro Ninja is a short video clip that went viral during the years before YouTube of a guy who fails while auditioning for a role in a martial-arts movie. At first everything is going great until Hicks up swings one of the Nunchucks into his own face leaving him with a bloodied nose.

Effects
Wielder becomes a master at nunchaku. There's a 1/5 chance that user will knock themselves out with the Nunchucks they are wielding