Blinker fluid. Muffler bearings. Headlight grease. These are all the subjects of pranks that you pull on someone who doesn't know anything about cars. And the girl in this video fell for it hard.
Watch as she comes storming out of the auto parts store, pissed that the employees wouldn't sell her "blinker fluid" and confronts her father/stepfather or whoever it was that sent her in. Needless to say, she's not pleased that the joke was on her.