Here is an old video of a guy who has just came on some girls ass. He rubs his dick a little and the girl back-kicks him in the balls. He goes down to the ground in pain in the girl spits on him, then walks away. There is no sound in this clip, but even without sound it is still one of my favorite ballbusting clips ever.
http://rapidshare.com/files/95266919/mariah11a.avi