I had resistive heating in an apartment in college. Sometime around when I moved in (August time frame, so still hot outside in Illinois), I was testing it out and clicked it on to make sure that it worked. I then forgot that I turned it on and left for the day.
Upon opening the door that night, and about the same time that I felt my skin begin to melt, I swear that I saw some free floating plasma just before the fusion reaction. Holy ish, it was hot in there.