Paddy is sitting on a train with his mate Mick.
Mick is doing a crossword puzzle. He looks perplexed so Paddy asks him if he's stuck on a clue.
"It says here 'Old McDonald had one'" says Mick.
"That's easy." said Paddy, "It's 'FARM'".
"Of course it is!" says Mick. "How do you spell it?"
"I'm not sure," replied Paddy,