Little Johnny was in a relative's wedding.  As he was coming down the aisle, he would take two steps, stop, and then turn to the crowd, put his hands up like claws and roar.

That's the way it went all down the aisle:  step, step, ROAR….step, step, ROAR….step, step, ROAR

As you can imagine, the crowd was near tears from laughing by the time he reached the pulpit.  When the priest who was celebrating the wedding asked what he was doing, Little Johnny sniffed and said, "I was being the Ring Bear."