That happened to DFD, he got pissed. I would too. Only time I've been hit in the balls was by a guy and I woulda killed him but I was too busy trying not to cry.
It fucking sucked. This girl handcuffed herself on accident to my buddy's bed and I found the key and wouldn't give it to her because she's an unbelievable slut. Her friend then proceeded to punch me really, REALLY hard in the balls. Oh boy, great times. =\