I may regret posting this, but here goes.
One day I was hanging out with my sister and our friends. She turns to me and says, "your head is shaped liked a raindrop!?!" From then on, everyone would call me "Raindrop Head".
My sister and I got into a lot of physical altercations (down and dirty fights) because I hated the name so much. Boy, she loved to antagonize me.

Anyway, we laugh about it now. BTW, I passed on my "raindrop head" to my son.