Not sure if it's a repost...but here goes my simple blonde joke attempt:
Two blonde's are in an elevator. The elevator stops, the doors open and a man walks in and smiles at both of them. He turns towards the elevator door with both blondes behind him. One of the blondes notices dandruff on the man's coat and whispers to the other blonde, "We should give him some Head and Shoulders..."
The second blonde looks confused and replies to the first blonde, "I know about head, but how do you give shoulders?"