California Highway Patrol

A woman gets pulled over for speeding by a California Highway Patrol motorcycle officer.
When he walked up to her window and opened his ticket book she said, "I bet you're going to sell me tickets to the Highway Patrol Ball." He replied, "No, highway patrolmen don't have balls." There followed a moment of silence while she smiled and he realized what he had said. He then closed his book, got back on his motorcycle and left.