Related Clues:

• Knuckle-headed antic?
• Playful knuckle rub
• Unpleasant accompanier of a headlock
• Bit of horseplay involving a headlock
• A real head-scratcher?
• Knuckleheaded act?
• Jocular headlock accompaniment
• Knuckle-to-the-scalp act
• What might accompany a headlock
• Knuckle-headed gesture?
• Affectionate knuckle rub