Related Clues:

• It's shorter than a one-liner
• Leno line
• Mischievous caper
• Don't be serious
• Play around
• Many an 'Airplane!' gag
• Billy, for one
• Make sport of
• Word with stuff or glove
• Comedian's bit
• Comeback, maybe
• Common fraternity activity
• Bad humor?
• Corduroy feature
• Cause for a groan