Okay I know I will probably loose karma for admitting this but here goes anyway.
I lent a"friend " some money to get him out of serious trouble, and I mean serious trouble as in physical harm, with the promise of being paid back weekly.
About a year later I was still owed the money but barely had any contact with him any more. Another friend told me that he said I wasn't ever getting the money back!
His girlfriend at the time was _to be Frank _ a slash who he had to be overly possessive with to keep her in check.
Anyway, long story short I showed interest in his girlfriend and got her to leave him to get with me. Destroyed him for a good while which made losing the money less of an issue.
Don't judge me, I'm really not a vindictive person, this was out of character for me