This video was taken awhile ago, but it has been reported again recently so always pay attention when you're at the pump.
This happened at the Costco off of Pelandale, in Modesto California. The person who posted the video said,
"I set the automatic stop on the pump when getting gas on Wednesday, February 4th. When I heard the *click* that my tank was full, I pulled the pump out and saw that the machine was still rolling numbers and taking my money as if it was still dispersing fuel. "