Two Irish terrorists are busy making letter bombs. Paddy turns to Mick and he says "Mick I don't tink I put enough explosives in dis one" "Well open it and let me see" replies Mick "But if I do dat it'll explode!" "It won't you eejit, tis not addressed to you"
There are two types of aeroplane, Spitfires and everything else that wishes it was a Spitfire!