Carrie Underwood Goes Undercover At Nashville Boot Store: WATCH

It's CMA time in Nashville and to celebrate, Jimmy Kimmel had Carrie Underwood go secretly into a Nashville boot shop to sing to unsuspecting customers. While an employee greeted customers and asked them about themselves, Carrie Underwood hid in the back and started singing about them. Eventually she revealed herself to much surprise and one strange reaction.

This reaction was our fav. Slight horror.