Pat and Mick are walking home after a night on the booze. They've got no money to get a taxi and are staggering all over the place when they find themselves outside the bus depot. Pat has a brainwave and says to Mick, "Get in there and steal a bus so we can drive home and I'll stay out here and look out for the police". Mick duly breaks into the garage and is in there for twenty minutes. Pat is wondering what the hell he's doing. Eventually Pat sticks his head around the door and sees Mick running from bus to bus looking very worried. "What the bleedin' hell are you doing, Mick, get a move on!" To which Mick replies "I can't find a number 27A anywhere, Pat." Whereupon Pat, holding his hands to his head in disbelief, shouts "You ******* idiot Mick, steal a number 42 and we'll get off at the roundabout and walk the rest of the way."