Shortly before 7 a.m., a driver managed to firmly wedge his box truck into the underpass eastbound at the Harvard Bridge, causing a nice little blockage just as rush hour was getting underway. He tried moving the truck back, but all he did was set of a shower of sparks from where his truck's roof scraped against the top of the underpass.
UPDATE: After working on the truck for around 45 minutes without success, the Cambridge Fire Department ordered an electric saw to the scene to cut the top of the fool thing off.