An Englishman an Irishman and a Scotsman are crossing a bridge

An Englishman an Irishman and a Scotsman are crossing a bridge, when suddenly a bald old woman appears.

"I am the witch who guards this bridge. Ye may only pass if you present to me a challenge which I cannot do."

The Englishman steps up first:

"I was the best footballer in my hometown. I bet you cannot kick a football further than me."

So the Englishman kicks a football, and it goes off into the distance, 5 football fields or so away. However the bald witch steps up and easily kicks the football twice as far. The Scotsman is next to challenge the witch.

"I was almost picked for the Olympic swimming team. I bet you can't swim to the other side of the river and back faster than me."

So the witch and the Scotsman jump in the river, but to the Scotsman's surprise the bald witch easily beats him to the other side and back.

The Irishman is the last to challenge the witch. He pauses for a moment, then pulls a comb out of his jacket pocket, looks the witch in the eyes, and starts combing his hair back.

"I bet you can't do this."