Related Clues:

• Joke, hoax
• Joke (colloq.)
• Amusing quip
• Pun, maybe
• Comedian's joke
• One might start 'Knock knock ...'
• Kind of reflex or order
• Type of reflex
• ___ reel (outtake collection)
• Funny team, not bottom of division
• One-liner, for instance
• Nearly choke
• React to a stench, maybe
• Palindromic joke
• Shtick bit