My three nieces were at the parents house to do some cleaning for them while they were away. A good deed to be sure, and while there one was making cookies for their kids. Not being familiar with their oven, she somehow got the oven in cleaning mode and just like Richards, it self-locked the oven door and went into high temp mode with the cookies in there. It wasn't long before they spontaneously combusted. There is a fan in the oven, i guess to exhaust excess heat as a temperature control, which does an effective job of blowing cookie ashes through the kitchen! You'd think all the ash was cleaned up but weeks later more would get blown out of the oven.
It never occurred to them to throw the breaker or unplug the oven after the door got locked.
I had an embarrassing moment with an oven on my first visit to my future in-laws. Background....The oven I had in my house was a microwave / conventional combo and the microwave was part of the oven itself not a microwave/exhaust hood as I am used to seeing now. Because the microwave was part of the oven, there was a lever to lock the door closed in order to use the oven in either mode. It was a safety feature so you couldn't open the door with just a pull while the microwave was on. I was very used to closing the oven door and sliding the lever over every time.
I went to the future in-laws house for the introduction visit / dinner. Of course I am trying to make a good impression and help out with dinner so I pick up the heavy roast pan for my future MIL and put it in the oven, sliding the lever over like I always do at my house while turning to ask her what temp she wants it on.....except the lever is the lock for cleaning the oven......and we can't figure out how to get it unlocked...... we did unplug the oven so it didn't go into high temp cleaning mode. It took a good hour before we got that thing open. we would plug it in try something and then unplug it again...I don't remember if it just timed out or if we actually figured out how to bypass it.