I remember mentioning to an acquaintance that I'd just bought a great new bike after coming into some unexpected money. He said "How many cc's?"

"Huh? Uh, I don't know exactly. But it has two bottle cages and I guess they'd hold 1.5 lit of water.... "

Took me awhile to figure out that he was thinking about a motorcycle because no self-respecting man would buy a child's toy to ride around on!