Cop on Horseback

A cop on horseback is at a traffic light, and next to him is a kid on his bike. The cop says to the kid, "Nice bike you got there. Santa bring that to you?" The kid says, "Yeah." The cop says, "Tell Santa next year to put a taillight on that bike." The kid says, "Nice horse you got there. Did Santa bring that to you?" The cop says, "Yeah." The kid says, "Well, tell Santa next year to put the dick underneath the horse, instead of on top."