Haven't found a link just yet, but right outside of my office, an 18-wheeler lodged itself under the pedestrian bridge just west of BU Bridge on Memorial Drive. It seems that he was heading from the Allston-Brighton tolls to Microcenter and inexplicably missed the left turn into their parking lot, missed the warning signs for low height at the Shell station, and ended up 70% of the way under the pedestrian bridge before coming to a complete stop.
EDIT: Channel 5 has more details and video/pictures. Thanks, J258.