Today was going too smoothly, so I managed to *burn glass* in a microwave.
The handle of this pyrex jug (almost certainly not "real" pyrex) touched the... grille? emitter? of the magnetron and stopped turning, and there was a loud buzzing sound and bright sparks for a couple of seconds before I flew across the kitchen and hit the open button.
WTF just happened? Why did glass do this? My first thought was "oh fuck did I leave metal in there" but I absolutely didn't.