That incident with the two drunken Secret Service agents who drove into a barricade... yeah, you know the one.
Every single story I've read regarding that has said, in one way or another, that both of them were driving.
Were they in separate vehicles? Do Secret Service cars have dual controls? Was one sitting in the other's lap? Were they both midgets, and driving Calvin-and-Hobbes style?
"Honesh', ossifer, nobody wuz drivin'. We wuz all inna back, shingin'!"