I can give you 1 right off the top of my head...
A few years ago, my aunt borrowed money from me... She never paid me back...Always had excuses...
One day, she was a victim of identity theft.. The person stole almost the exact same amount of money, that my aunt basically stole from me... And to this day, she's never been compensated.
In my opinion, that's karma. What goes around, comes around.
Did I ever get my justice? Get my money back?... No..
But, the way I see it, her action incurred a reaction.
i'm interested to know what you think makes karma happen.