My poor stoker forgot the tandem was racked on the roof of our car when she pulled into the garage. She had thought about it just a second or two beforehand but--bash!!--the tandem smacked right into the house.
Though it looked quite horrifying (I was right behind her when it happened), and I thought the frame would be bent, it turned out that the rack mounting slipped, taking up much of the force. The Ultegra STI shifters "ate" a bunch of stucco and our rack, though bent, is OK. The Murano has a gouge or two and the house has two nicely-formed holes that have the shape and contours of STI shifters and brake hoods.
But the bike is OK!!! The stoker's psyche is a tad damaged but we had a terrific ride this weekend in preparation for a multi-day tour this summer.