Not a breakdown, but definitely a crazy experience in my book:
My wife and I were at DHS one night during Extra Magic Hours. This was back when they would give out wristbands to a select few who would be allowed to stay in the park (also when they did the Cinderella Castle Suite, I forget the name of the promotion). Anyways, my wife and I decided to make our last ride of the night the Great Movie Ride, which was pretty awesome with just the two of us and the guide. Nothing out of the ordinary happened on the ride itself, but after the ride, we were greeted by an Imagineer while getting out of the ride vehicle (I immediately recognized the Sorcerer Mickey name badge!). He told us that he was going to make our magical night more magical and took us through the last scene of the ride (the giant video screens) ON FOOT!! We went up to the projector room, and he told us the story of how Walt purchased the company that made the projectors that were eventually used for the ride (much more detail to the story that I forget). After this awesome experience, we went out of the park to catch the bus back to the All Star Music Resort only to find that the bus service was over for the night. We had to walk to the Boardwalk Resort, where we found two cab drivers arguing and telling the other to, basically, stay off of the other's turf (you can't make this stuff up). We managed to convince one of them to give us a ride, perhaps against our better judgment. He drove like a bat out of hell, and got pulled over by a Disney police officer as he dropped us off. So yeah, crazy experience.