Related Clues:

• Sound of laughter
• Result of a crack?
• Laughs
• More than a tee-hee
• 'Very funny!'
• A few laughs
• Surf's sound
• Engine sound
• Comic's favorite sound
• Crowd sound
• 35-Across's sound
• Surf sound
• Rumble
• Sound of breaking up?
• Fireball sound