In the office one day and suddenly water starts dripping, then pouring, through the ceiling. Rush upstairs and bang on door, which is answered by a raddled looking bloke trying to look innocent. "'ello, can I elp you?" he says in perfect Clouseau. "There's water pissing through our ceiling!" We say. "Ah," he says, looking uncomfortable. At which point I notice the spreading puddle coming from under that door.
Run in, open the door, there's water at mains pressure spraying out of a pipe under the sink. "What the XXXX?" Next to it, a drill on the toilet seat. He's only drilled a hole straight into the pipe, then just left and closed the door when it all went pear-shaped. We look at him accusingly. "It did not leurk lek a peurp," he says. Became a sort of office catch-phrase for truly numpty behaviour.
Like the time I put the power mower over the cable, picked up the cable, saw the bare metal, thought 'wonder if that's live?' and prodded it with my finger to find out...