Related Clues:

• Sample of wordplay
• Ones for the answers to 1-, 25-, 37- and 50-Across are hidden in their clues
• Knock-knock joke, usually
• 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.
• Angered and enraged, e.g.
• Word joke
• Chesty and scythe, e.g.
• Lionel and O'Neill
• ''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.