British firefighters were "seriously unimpressed" when they were called out to rescue a YouTube prankster whose head was cemented inside a microwave. A video posted to YouTube by 22-year-old prankster TGFbro shows his head being cemented inside a microwave with Pollyfilla with a plastic bag protecting his face and a tube feeding him air. The prankster tells his friends that, despite the precautions, he is having trouble breathing, and they attempt to free his head -- without success. The West Midlands Fire Department was summoned to the scene and firefighters spent about an hour freeing the man's head. "We're seriously...