Paddy walks into the pub and as he is walking up to the bar, he stands in a pile of dog muck, slides and falls on the floor. He dusts himself down and gets his pint of beer.
A few minutes later the biggest navvy ever walks through the door, walks towards the bar and stands in the dog muck and slides across the floor.
Paddy says, "I've just done that."
The navvy stood up and thumped Paddy................