Would you ...
Keep the information smugly to yourself and know that karma always finds a way?
Make a wax effigy and stick pins in it?
Create a character in your next novel, warts and all, and see who recognises them?
Let them know that you know what they've been doing/saying?
Give them a long, slow and painful death in your next novel?
Contact the Jeremy Kyle show and let them sort it out?
Do something else?
Say and do nothing?
Tell the wronged party/parties?
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Created at Crowdsignal.com