Have you ever seen the show, Cash Cab?
People get into a cab in NYC, and right after they tell the cab driver their destination, lights start flashing and a loud noise is played. Then the cab driver reveals that the riders are in the Cash Cab and there is a hidden camera.
The driver asks questions on the way to the destination and every correct answer wins cash.
Three strikes, and the cab pulls over and puts the riders out on the street. The riders are not charged any cab fare, so unless the process makes them late to where they are going, no harm done.
Anyhow, one day these two guys get into the back seat and they turn out to be Penn and Teller! It was a great show. When they got to the destination and the cab driver handed them the cash, they said they were going to donate it all to the event they were attending.
I don't think it was prearranged. I think the cab driver was just as surprised as Penn and Teller.