It should go without saying that you probably shouldn't put cement anywhere near your face. Let alone try and make a mould of your face with the stuff. Not only would you probably end up in a sticky situation, you'd also waste the time of emergency services when they come to get it off.
YouTube prankster Jimmy Swingler from the United Kingdom, one half of the TGFbro channel, seemingly decided that it would be fun to mix seven bags of Polyfilla and pour it into a microwave which he'd put on his head, with his face only protected by a plastic bag.
Unsurprisingly, his friends were unable to remove the microwave and had to feed an air tube into the man’s head to help him breathe.