A piece of red tarmac and a piece of black tarmac were sitting quietly in the pub having a beer when this piece of green tarmac walks in, beats the living daylights out of the red piece of tarmac, and then storms off again.

The bartender says to the piece of black tarmac, “What the heck was all that about?”

The piece of black tarmac replies, “You have to be careful not to upset that one. He’s a bit of a cyclepath…”