Me too, Pippa and Champagne. I was told once that if you have bad thoughts or feel angry/churned up/murderous inside, and have no channel for these negative emotions, they stay with you and affect you personally.
I know someone who never has a good word to say about anyone - always sees the bad in everything - truly hates people for little or no reason - holds grudges etc She's ended up divorced, living alone, no friends, never goes out, and her face as she ages is becoming more and more ugly. (For want of a better word!) There is no joy in her life and her unkind nature just shows through. She was married to my uncle and treated him appallingly. She now hates him, his girlfriend, my mum (who has called round often to help get her out and about.) She's as good as crippled with arthritis and can't straighten her fingers. She's destroyed things of no great value belonging to my uncle - precious family things though, like a bible signed by the men in the family going back many generations that should have gone to her own son, but which she's burned anyway out of spite! She really proves the theory that what goes round comes round, as now noone wants to help any more. Last time I saw her I barely recognised this haggard, witchy-looking woman, and she was only just 50!
So in the end, the best thing is to get on with your own life and let things take their own natural course - bad things happen to bad people, I'm convinced!!
On a lighter note though, one revenge story my sister's friend tells:- she was walking alongside some cars at traffic lights when a bloke made some lewd comment or other to her. She walked over to the car, leant in (driver thinking he's pulled!) and smacked him in the mouth. He was so startled, he took his foot off the brake and kangarooed into the car in front. She just left him to it....! I've always liked that story - maybe sometimes a quick bit of instant revenge IS best!!??