Carrie Underwood serenaded unsuspecting customers at a boot shop in Nashville, and their reactions were priceless

• Carrie Underwood popped up at a boot store in Tennessee called Nashville Cowboy to serenade unsuspecting customers for the latest "Undercover Sing" segment on ABC's "Jimmy Kimmel Live."
• The 36-year-old singer and cohost of the 53rd CMA Awards stood behind a curtain and spied on shoppers as they browsed the shop.
• She went on to sing "Before He Cheats" and "These Boots Are Made for Walkin,'" replacing the lyrics with information about the shoppers.  
• After Underwood appeared, one person said "no way" and added: "Is it really you? You made my day."
• Watch the video below. 
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