Yeah, I had the same thing happen, though I don't think it was the same day (a month or two earlier is my vague recollection.) I was driving north into DC and it was startling enough to make me think "Waitaminute! There *aren't* any mountains just on the other side of the city!"
*nod* It's not the "hey that cloud looks like mountains" that gets ya', it's the "oh yeah, mountains ... Hey, Waitaminute!" that makes the experience what it is. Freaky.
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