Tourist #1: I won­der how they build streets on top of the sub­ways.
Tourist #2: Hmm. You think they’re strong enough that they can sup­port the street all by them­selves?
Tourist #1, af­ter some thought: Nah, there’s got­ta be a lay­er of dirt be­tween them or some­thing.

–42nd & Lex­ing­ton

Over­heard by: Matt