Bricks?

Last week the kids were outside playing in the backyard. I was inside making cards and John was making dinner. I hear John tell Ben that he needs to come and talk to me about something. So in walks Ben and he is holding something. I ask him what happened and this is what he told me: "Momma I peed a brick!" Excuse me you did what? He told me again that he peed outside ( I am so proud, insert sarcasm here) and when he pulled his undies down and went pee a brick fell out. So he thinks that he peed a brick. I am guessing since I know it isn't possible to pee a brick that he had been playing with the bricks and a piece fell down into his undies or at least down his shirt and when he pulled his undies down the brick fell into place!!! He still thinks that he peed out a brick so anytime he has pain or anything in his southern regions he thinks it is another brick trying to come out.