There's a little boy who loves tractors. On his 17th birthday, his mother gives him a trip to a tractor fair, but he gets badly injured, leading to a lengthy stay in hospital. He says he's never going near tractors again. Years later, he's in a pub when he catches the eye of a beautiful young lady.
She's crying, and he asks her what her trouble is. She replies: " It's the smoke in here". He thinks: 'What can I do to make this better?' He then blows & blows, which stops her crying. She asks him how he did it and he says: "Well I'm an ex-tractor fan."