Granny & the Bank Manager's Balls

An old woman walked into a bank and asked for the manager. He took her into a small room, and asked him if she could take out a loan of $500.000. He asked her how she was ever gonna pay it back.
"I make bets," she answered slyly.

"What?" replied the manager.

"I make bets with people, and win their money. Take this for example: I'll bet you $25,000 that your balls are square."

"You're on," said the Bank Manager, feeling quietly confident.

The next day granny and her accountant came by the bank and went to see the bank manager.

"Now then," she said, "to make this fair, I have brought along my accountant. Now pull your trousers down."

"OK, anything for 25 grand..." he said

"I'll just get a wee feel now, to make sure."

While granny was doing this, the accountant began to bang his head on the wall.

"HAHA!!! They're round!" cried a delighted bank manager. "By the way, what's wrong with your accountant?"

"I bet him $500,000 that I'd have the bank manager by the balls on Friday morning!"