The first lady of heavy metal, Sharon Osbourne, dumped a bucket of water on a London cameraman who sprayed her with a squirt gun that looked like a microphone.

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Ozzy's wife was reportedly furious and afraid when she was squirted during filming for the Channel 4 TV show "Grand Classics," the London Daily Mirror reported Wednesday.

"I think it was supposed to be a joke, but Sharon was taken aback and saw red," witness Simon Lloyd told the newspaper.

"She screamed, 'You (expletive) (expletive)! Sharon picked up a champagne bucket and ran after him," Lloyd said. "She looked pretty hacked off. But she did laugh after soaking him."

Osbourne "was terrified it might have been acid or ammonia," a source told the newspaper.

Osbourne declined comment on the incident.