Explosives.

I once lived with three other girls, one of which had just bought a new microwave. One night, she and I came home to find that something had exploded in the microwave. My roommate was pissed; not only did someone explode something but they just left it there! She knocked on the other girls’ bedroom doors and the culprit came running out of her room, “No, no, no! It’s okay! It’s just wax!” and points at her arm. It’s okay to explode wax in the microwave because you waxed your arms? No.