James Cann warns that this pitch might hit the cutting room floor before it gets anywhere near your TV screens, but it’s a gem nonetheless.
"A couple came in and they had a bed set up on the stage to show us their invention," he says. "It was a bed sheet with a line down the middle."
"They had this whole spiel about how couples were always fighting about who took up more room in bed. " Caan shoots a perplexed look at the audience. "I thought, ‘I must be missing something.’"
So he aks them, "Is this just about having a line in the middle of the bed "
The couple nod, and inform the Dragons that they have patented this "line", investing £40,000 over four years on developing the product .
But the killer moment, the television gold, comes when Theo Paphitis and Peter Jones elect to "try out" the bed.
"They went and lay down on the bed," says Caan, giggling. "And they got into a spooning position, to see whether the line was effective."