I read somewhere once that if you're right-handed your left testicle will hang lower, and if you're left-handed your right testicle will hang lower. However, I know a left-handed guy whose left testicle hangs lower, so if the rule applies, there are exceptions.
I've also read that for the majority of men the left testicle hangs lower, regardless of their right- or left-handedness. (Because most men are right-handed, the rule above seems to apply, but not really.)
Anyway, my left testicle is lower, and I'm right-handed, although the two may have nothing to do with each other.