thankfully most of my seat mates are great.... i keep myself to myself and engage in polite conversation at the beginning and the end. Most respect that.
I did have a happy drunk a few weeks back on a morning flight out of SNA, drank bloody mary's and then Bourbon the entire way. I got his card and an invitation to his weekend "place" anytime.... wonder what his wife (nice looking lady, saw her photo) would say if we showed up for Thanskgiving...
He was a nice guy, just talked to much!