Since we were planning on doing some camping on our trip, we had one of those car top carriers on the minivan. I forgot it was up there and when we rolled in to the metro (subway) station, I drove right on in to the parking garage only to hear sccccrrriiiiitch KLUNK! Uh oh. I stopped immediately and Paul and I hopped out to look. We pulled the minivan into the first available spot and decided we'd deal with it after we got back from DC.
The Washington Monument was under construction. Seems it was always under construction when I was growing up too, but when I was pregnant with Pierce, Paul and I got to go up in it. It was really interesting - I loved all the sculptures on the walls inside for the elevator ride back down.
When we got back to our car, after debating the best options, we ending up emptying the carrier, dragging it out of the parking garage, and then backing the car out of the garage to put it back on. Not the best thing we've ever done, but we honestly couldn't think of any other way out!