Here's one I've been meaning to share for a while.
Once upon a time there was a bright young boy who developed a passion for tractors. He drew pictures of tractors, spent his time learning about how they worked, what different kinds there were and all that. His walls were covered with pictures of tractors, and his shelves filled with model tractors.
Now, as his schooling progressed and he got older, his parents persuaded him that perhaps it was time to let go of this hobby and focus on more pertinent matters. Reluctantly he agreed, and gradually the tractor paraphernalia disappeared from the house. In the heel of the hunt, he was very successful, and once he got a job he quickly rose through the ranks of the company to become one of the top dogs.
Once he reached the top, it came time for the young man to attend a board meeting. He was brought into the board room, where he found he couldn't see a thing. The place was full of smoke from all the cigars being smoked by the other big-shots. His reaction was utterly bewildering: he opened his mouth and with a big gulp, sucked in all the smoke, clearing the room. He then went over to the window, opened it, and spat the smoke out into the air outside. As he turned to the shocked executives, one timidly asked:
"H-how did you do that?"
"Oh, that's simple," the young man replied, "I'm an ex-tractor fan!"