Not an uncommon incident.
The university I went to did not repair the door of the computing room after a similar incident for many years. It had several shards from a plate embedded into it. Someone apparently did not fix the pack properly. It was a living reminder - computers can be dangerous :)
There were other funny stories from the same period - like the engineering school VAX had a well established boot mark on one of the cabinets. The operators were told - if it gets stuck, you reBOOT it. BOOT there and exactly there. Geddit?
Biting the hand that feeds IT
