I actually did this to a journalist I knew who was really getting on my wick with his inscessant banging on about 'perves' and predatory behaviour (in a non too disimilar case to JK)-mainly over a gay lawyer who was subsequently found innocent-sued newsapers and TV stations in a libel case that lasted 5 years, won $6M in damages whilst all his teeth fell out and then died of cancer within 18 months.
This gutter rag writer persisting after the unfortunate man's death to impugn his reputation and imply the usual "no smoke without fire" rubbish.
I researched the writer's background and found remarkable co-incidences of where we had been at the same places at the same time. He was 15 years older than me.
I wrote him a detailed letter siting several times and places-as an experiment-where I could accuse him of sexually assaulting me-reminding him that I would remain totally annonymous in the media whilst his name would be dragged through the press.
He'd probably be suspended and all claims of being a hetro would fall on deaf ears and probably have the opposite effect and convince people he was a closet gay. I detailed a media campaign where I could speak to tabloid TV shows with darkened profile about the vile things he made me do.
The worse that could happen-I wouldn't be believed but I had done my homework and would make a convincing witness. I'd walk away while his reputation would be ruined forever..and if I won I detailed the compensation I would be chasing.
It was to show him how easy it could be done.
Gutless swine never replied and never even looks at me now.