Not sure if it qualifies, but here it is: I had to replace a 2M Blue stylus on a Pioneer PL-514 semi-auto because my cat jumped on the turntable while I was at work one day and jarred the tonearm off of the rest. Silly me had forgotten to lock the tonearm, and being semi-auto, tonearm movement starts the motor. So, with the platter turning, the outside edge of said platter, which has almost half an inch(1.7cm or so)of exposed aluminum(or aluminium, for our UK friends
), is where the stylus decided to land. Don't know how long it was running, but there is a nice, deep groove in it that wasn't there before, a reminder to check the little things!!