Police were called to a recording of popular BBC programme The Antiques Roadshow this morning when a scuffle broke out over a couple's claim they were being conned.
Ken and Liz Bonkers went to the recording, at Kew Palace, hoping to get a valuation on a pair of arms they claim belong to the famous Venus De Milo statue.
The couple, of Harlesden, north London, bought the arms while on holiday on the Greek island of Zakynthos.
"We were just browsing for souvenirs and presents one day when the guy asked if we were looking for anything special," said Ken. "I said we were always up for a bargain and he has a think, and he shows us these arms.
"'They are from famous Venus De Milo, armless lady in Paris,' he says to us. He only wanted 80 euros for them, so we snapped 'em up."
When they returned home, Mr and Mrs Bonkers learned The Antiques Roadshow would be filming at Kew and took the arms along to have them valued for insurance purposes.
A spokesman for the programme said that things turned ugly when expert Eric Knowles pointed out the arms' shortcomings.
"Mrs Bonkers apparently took great offence when Eric started asking if this was a joke and wondering if he was being subjected to a Candid Camera-type set-up.
"When Eric started to scratch the broken end of one of the arms and pointed out that they had been made out of plaster-of-Paris, not marble, she grabbed it back and started swinging it about - narrowly missing Eric's head."
Show presenter, Fiona Bruce, and a camera man were slightly injured when a finger flew off the arm, the spokesman added.
According to police, when officers arrived Mr and Mrs Bonkers were "squaring up" to several members of the TV crew and other members of the public shouting about being "conned" and "ripped off" by the BBC.
Said Mr Bonkers today: "Those buggers can't pull the wool over our eyes! We're going to take these arms to Paris and that'll show 'em."
A spokesman for the Louvre museum, home of the statue, said Mr and Mrs Bonkers would be welcomed, but they were not expecting to be able to validate their claim.