Balls
I had to take my cat Norman to the vets at the weekend for his jabs. I walked into the surgery feeling hungover and wanting to get out of there as quickly as possible. After the vet had done his duties he picked up Norman to do his usual checks at which point he started laughing.

I asked the vet what had caused this chuckling and he exclaimed that my young feline companion has one white testicle and one black testicle.

The sight of Norman's multicolour scrotum kept me amused all day.
(CasuallyObscene, Thu 6 Dec 2012, 13:47, Reply)