Two Irishmen were on holiday in the United States and went to see Niagara falls.

Over drinks one night, one bet the other $500 he couldn't carry him across the falls on a tightrope.

After a very scary trip his friend managed to deposit him safely at the far end and the $500 was duly handed over.

"Pity," said the loser, "when you wobbled half way across I was sure I had won."