The version I heard was where an old man gets a heavy cold in the middle of winter and 'dies'. At the funeral, it's snowing heavily when the hearse arrives at the cemetery. One of the pall-bearers slips as they're removing the coffin from the hearse and they drop it. It starts sliding down the hill like a bobsleigh on the Cresta Run and, at the bottom of the hill, speeds into the local chemist shop. The lid swings open as it whizzes past the counter, the old man sits up and shouts, 'Have you got anything to stop ma coffin?'
yeah i should probably have got that one Dev, but i reckon gustavo's is better, mainly because i didn't need to ask him to explain it!