Something similar happened to me a few years ago - cabin crew member put her hand bag in the oven for safe keeping whilst pax boarded, then her colleague turned the oven on after take whithout checking inside!
I really don't understand what happens when some of my colleagues get on the plane... is the brain extracted or just temporarily numbed?
They were talking about putting toasters into the First galley using the AC point there.... luckily it didn't come to pass cos it sounded like a recipe for fire to me (looks like a toaster, perhaps I could use it as a menu holder or told hold newspapers)