Related Clues:

• Quirk
• Deviation
• Odd occurrence
• '___ drink Pepsi, but ah'll have a Coke few don't mind'
• Irregularity
• Peculiar situation
• Peculiarity
• Freak
• It's not the norm
• Departure from the norm
• Peculiar thing
• Deviation from the norm
• Aberration
• Blip
• Something strange