Sitting at National airport, watching USC basketball and waiting for my flight back to Austin, a lady walked by my table and made what she called a "strange request" -- she asked if she could use my laptop really quickly to send a note to her boss. I figured, what the heck, she looks nice, and it's good karma. And I know the feeling - though it hasn't happened to me since I got my blackjack last year.
She sat down and started typing, and we chatted a bit... it turns out she is going to Israel to visit her son. She didn't bring her blackberry because she doesn't have international service on it, and she really needed to send an email. I mentioned that I hadn't been to Israel since my bat mitzvah, and we had a laugh about "Jew-dar." :)
She told me she'd be at the Wailing Wall in Jerusalem tomorrow, and would say a prayer for me.
So there you go, I'd say that's good karma!