Firefighters in the UK are unimpressed after they had to rescue a man who got his head stuck in a microwave.

It took a crew from the West Midlands Fire Service one hour to pull apart the microwave and free the 22-year-old's head, Watch Commander Shaun Dakin said.

Firefighters spent an hour pulling apart a microwave to rescue a 22-year-old in the UK. Credit:West Midlands Fire Service

"He and a group of friends had mixed seven bags of Polyfilla which they then poured around his head, which was protected by a plastic bag inside the microwave," he said.

"The oven was being used as a mould, and wasn't plugged in. The mixture quickly set hard and, by the time we were called, they'd already been trying to free him for an hour and a half."