Tony's strange manner of playing a game at bedtime

Tony was playing a game of some sorts that had his parents wandering.  What he did was this:  at bedtime, he and his parents were lying in bed -- Tony stood up and made his parents put their feet together so that the feet were about 18 inches above bed.  Tony would then try to jump over his parents' feet.  If his parents didn't put their feet together in manner to his liking, he got really angry and would grab onto the feet and put them together himself.

Why he did this, we have no idea.