Related Clues:

• They may be tickled
• Tickled ones
• Some keys
• Piano keys, slangily
• Piano keys
• Teeth, slangily
• Keys, so to speak
• Some piano keys
• White piano keys
• Many keys
• White keys
• See 12 Down
• They don't laugh when they're tickled
• Informal piano keys - tickle them
• Tinkle them on the piano