Two groups charter a double decker bus for a weekend trip to Atlantic City. One group is all brunette and the other is all blonde.

Once upon the bus, the blondes head upstairs and the brunettes hang out on the bottom level.

The brunette group has a ball. They're whooping it up and having a great time when one of them realizes she doesn't hear anything from the blondes upstairs. She decides to go and check on them.

When she gets up to the top deck, she finds all of the blondes frozen in fear, staring straight ahead, each clutching the seat in front of them.

"Whoa, whoa -- what's going on here? We're having a GREAT time downstairs!"

One of the blondes replies through chattering frightened teeth, "Yeah, but you guys have a driver!"