Last year, NASCAR driver Jeff Gordon pranked a used car salesman by taking him on an insane test drive.  Some people thought it was staged, including a guy named Travis Okulski who writes for the website

Jeff tried to prove to Travis that the last one was real by posing as a taxi driver, picking him up, and running from the cops with Travis in the back seat.  

It took Pepsi a lot of money and time to pull this off, but it worked out perfectly.  Naturally there are already people out there that think this is all fake too.