Mick decided to wallpaper the main bedroom and was wondering how many rolls of paper he needed. Knowing the pair of semis were exactly the same size, he had the bright idea of asking Tommy from next door how may rolls he bought when he papered his bedroom.

"Hey Tommy, how many rolls of paper did you buy when you papered your main bedroom?"

"Ah Mick, to be sure now I bought ten rolls."

Mick thanked Tommy so went off and bought ten rolls after choosing the pattern he liked best. He pressed on with the wallpapering and when he'd finished he'd got two rolls left over so went round to see Tommy.

"Hoi Tommy, I've just finished papering the bedroom but I had two rolls left over?"

Tommy replied "Dat's funny, so did I".