Paddy buys a chainsaw which guarantees to cut down 50 trees in an hour!
Paddy sets to work but only cuts down 25 trees in the hour!
So he takes it back to the shop and says to the owner.

"This doesn't cut 50 trees an hour cause I only managed to do 25.
With that the shop owner starts up the chainsaw!!

Paddy looks at him and says, "WHATS THAT FLIPPIN NOISE!!"