Only the Irish
Two bowling teams, one Irish and one Scottish, chartered a double-Decker bus for a weekend trip to London. The Scottish team rode on the bottom of the bus, and the Irish rode on the top level.
The Scottish team down below really whooped it up, having a great time, when one of them realized he hadn't heard anything from the Irish upstairs. He decided to go up and investigate.
When the Scotsman reached the top, he found all the Irish men in fear, staring straight ahead at the road, clutching the seats in front of them with white knuckles. The Scot asked, 'What the heck's going on up here? We're having a great time downstairs!'
One of the 'Paddies' looked up at him, swallowed hard and whispered... 'YEAH, BUT YOU'VE GOT A DRIVER!!'