An investigation has been launched after a bus driver was apparentlycaught on film - weeing out the door of his bus. The film shot by a passerby appears to show the cheeky driver zipping up his flies after peeing out of the gap beside the central doors of his empty bus.Johnson Rotimi, captured the embarrassing momentthrough the window of the Arriva bus parked in Crouch End,London.Baffled Johnson said: "I just happened to walk by and I saw himdoing his thing."He actually hadn't left the bus at the time."You knowthe second doors? He was actually peeing in the corner with his backfacing towards me, through the little gap between the doors and thebus."When I saw him I was kind of shocked to be honest, then I quicklygot me phone and started filming it. "He was quite angry when herealised. He did give me a bit of a middle finger." The moustacheddriver was taking a break to check his bus - the W3 from Finsbury Parkto Northumberland Park - when he stopped to spend a penny in ElmfieldAvenue.