How surprised would you be if Jeff Gordon showed up at your door?

Tonight, on Tuesday, July 28th at 9pm ET, you can watch the new unscripted series "Knock Knock Live" as Gordon meets super fan, Chad, face-to-face in Indianapolis.

Chad is a Jeff Gordon super fan who became interested in NASCAR at an early age as the grandson of semi-pro race car drivers. His passion for the sport began after attending his first race, the Daytona 500, when only 16 months old. It was then that his obsession was born. His life took him in a different direction than that of his grandfather's racing, but Chad is a proud husband and father who is a diehard fan.

During his final Brickyard 400 weekend, Gordon drove his No. 24 Axalta Chevrolet SS to Chad's hotel and knocked on his door.

The video below shows a clip from the show which is hosted by TV and radio personality Ryan Seacrest, who is also the executive producer for the show.

How would you react if Jeff Gordon showed up at your door? Feel free to leave a comment at the bottom of this page.