Fire service officials said it took an hour to free the man after they were called to a house in Wolverhampton city, reports the BBC.
We're seriously unimpressed 😡.- West Midlands Fire (@WestMidsFire) December 7, 2017
Five of our firefighters were tied up for an hour this afternoon, freeing a YouTube pranker whose head had been 'cemented' inside a microwave oven. Read more: https://t.co/6bZReGuKQX (Photos © West Midlands Fire Service) pic.twitter.com/2ch2UhszeH
Friends had managed to feed an air tube into the 22-year-old's mouth to help him breathe, the service said.
A senior official said the man "could quite easily have suffocated or have been seriously injured".
"He and a group of friends had mixed seven bags of Polyfilla (cement) which they then poured around his head, which was protected by a plastic bag inside the microwave.
"It took us nearly an hour to free him," the official added.