The Brick Wall Trick

The Irishman played The following trick on The Englishman. He put his hand up against a brick wall and said, 'Now punch my hand as hard as you like.' When The Englishman attempted to do so, The Irishman pulled his hand away and so The Englishman banged his fist against The wall. After a good laugh all round, The Englishman went away to try out The trick on The Scotsman.
'We really would need a brick wall to do this trick properly,' he told him, 'but there doesn't seem to be one around. Never mind, I'll put my hand in front of my face.'