Highly Strung

A man got on a bus in Derry, and was just sitting there quietly when his neighbour took a piece of string out of his pocket, walked up to the front of his bus and started dangling it in front of the driver. The driver immediately burst into tears, and the man put the piece of string back into his pocket and returned to his seat.
That driver,' he said, 'he's got no sense of humour at all.'
'What do you mean?' said the Derry man.
They're hanging his brother tomorrow.'