At an industry meeting I attended today, I had a civil chat with my ex-boss from the last airline I worked at. I even initiated the conversation.
While it might have been fun to rag on him, I got enough satisfaction by letting him know I was doing well in my current job, and that I'd just been signed off to dispatch international flights (the most fun moment was him asking, "So, where all does your airline fly internationally?" followed by me listing several European countries, most of Central/South America, plus China, Japan, India...) I guess I didn't know I had it in me to be polite like that to someone I used to despise.
Watch out for flying pigs tomorrow morning on your commute to work.