Related Clues:

• ''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
• Unit of wordplay
• Bit of word play
• "My bike won't go because it's two tired," e.g.
• "I'd like to study philosophy, but I just Kant," e.g.
• 'The lowest form of humor,' per Samuel Johnson
• Groan trigger