When I was teaching English in Japan, we would occassionally play Jeopardy. One of my teachers enjoyed the category 'capitals,' and this was a word the students all knew and understood. One of the more difficult questions asked 'What is the capital of Canada?'
Now, I don't blame them for not knowing the answer. I didn't know the answer. But the answers they did give...?
I was riding the train home one day, and glancing out the window I recognized an intersection I'd often driven through with friends. An intersection that had train tracks going through it. The first thought that popped into my head was "Huh. I didn't know the train crossed tracks here. Wait... Where're the tracks? ... oh yeah. We're on them."