I was talking to my grandpa.  I said,

"Let me see your legs."

He showed me his legs.

I said, "I don't get it.  You're not that hairy; dad's not that hairy.  Why am I so hairy?"

He looked down quickly smiling, "It fell off."

I responded, "So you lost hair up there, and then there?  Oh man!"  I laughed for awhile.

He said, "Well, where did hair come from?  Weren't we full of hair all over our faces and bodies back then?"

"Well they say, we were apes, and then we were black,--"

"Right, so--"

"Maybe there was something in the grass back then....I guess...Thanks, Grandpa!"