Related Clues:

• A comic reaction?
• 'Good one'
• Joke reaction
• Sounds of glee
• Laugh-track snippet
• Punster's reward
• What a lame joke might elicit
• Catchphrase for Nelson on 'The Simpsons'
• Facetious "Not funny"
• 'ROFLMAO!'
• LOL relative
• Crack response
• Gloater's taunt
• Nelson's catchphrase on 'The Simpsons'
• "That's a riot—not"