A topic that I found interesting at two recent business dinners (which I brought up, thus the fact it happened twice) is what's on your bucket list. Bucket list being what you'd really like to do or accomplish before you die (a.k.a., "kick the bucket"). And what you've already done that might have been on that list.
It's really fascinating what people want to do. And it never seems to involve a job (current or future).
Also ... here's an earlier post on other conversation starters.