London - It's a karmic echo of the 17th century play about fraternal incest first performed in London's Cockpit Theatre.**
Today a microblogging gag-buster rant threatens to out a pair of UK Z-Listers' DNA test results.
Known only by entirely assumed names of 'Jeremy' and 'Jemima' the handsome couple have been dubbed a modern Giovanni and Annabella after the play's principals.
This week's unfolding online drama sees Ms J continue a vehement denial about shagging Mr Y, a popular UK TV show host.
But a remarkable facial resemblance and mutual talent for self-publicity have sent alarm bells ringing in the blogosphere.
"The brother and sister angle is new to me," Twatter blogger @SkankyDave admitted, "any mutant kids involved?"
** Subsequent versions of the play attribute the incest's first faltering fumblings to the Tricycle Theatre - where a ménage à trois develops with a mystery third sibling.