My nephew has no butt, and hasn't yet learned that when his pants start to fall down he needs to pull them back up. When we all went down to visit them in August, my BIL and nephew were holding hands and crossed a road but the light changed so the rest of us got stuck across the road waiting, and nephew's pants just fell down. We were all calling out BIL's name (well, A and his dad were, SIL and SMIL and I were on the floor laughing) but BIL only noticed when nephew said 'Look what happened, Daddy!' Nephew was so totally chill about being pantless in the middle of the road. He's 5.