Related Clues:

• __ rule
• Witty bit
• Prankster's bit
• It's a joke
• Short joke
• Respond to a really bad joke, maybe
• With 29-Down, 'Do not discuss this' ban
• Brief joke
• Laugh line
• "Eww!"
• Restrain, in a way
• Jokester's bit
• Squirting flower or dribble glass
• Silence, in a way
• ___ reflex