If someone as a joke did the setting fire to my face thing, I'd beat them senseless and then never speak to them again. There is doing stupid crap, by your own choice, and there is risking ruining someone's entire life with horrible disfigurement. Shaving foam... sure fine, haha, lol, wooo. Fire, put fire on someone's face, then when it goes wrong their head is ON FIRE, their hair is on fire, they get horrible burns........ how stupid do you have to be to do that to someone.
Also that last gif I was just waiting for him to chop his own hand off.........