Related Clues:

• Groaner?
• According to Oscar Levant, it's "the lowest form of humor--when you don't think of it first"
• ''Pick a cod, any cod,'' e.g.
• Word joke
• ''My bike won't stand up. It's two tired,'' e.g.
• Nash specialty
• ''Don't be fuelish,'' e.g.
• ''Plain fair,'' for one
• 86-Across, e.g.
• ''Queen of denial,'' e.g.
• Knock-knock joke punchline, usually
• Alexander the Grape, e.g.
• It may not have been intended
• Groaner, sometimes
• Many a joke involves one