Yeah, I don't even know anymore. No, the water didn't boil over. No, there wasn't anything in the pot. No, there wasn't anything on the stove.
I think maybe the pot was wet when I used it (although... it was left to dry overnight...), so the stuff might be cooked soap scum? Burned hard water residue??
Long story short, ELECTRIC STOVES SUCK
I have a lot of kitchen disaster stories, stay tuned
but actually if anyone has a solution to this mess, please send help, it's currently soaking in vinegar
13/500