Yesterday my 7 year old grand son was showing his mother and me, his "wounds". He had band aids on both of his knees. He raised his pants well over his knees to show us and there on the left side of his thigh was a huge ugly bruise. His mother asked him where he got it and his reply....WAIT FOR IT..... As he pointed to the band aid on his knee and said...."It came with this one!"
I almost peed with laughter. What?? They obviously come in pairs. It was perfectly logical to him.