I'm with DB - I've started surprising myself talking to strangers on public transport or in shops etc. I don't usually start it off but I've started responding warmly and sweetly. I can't believe what a nice warm feeling I get when I do - its like I've done something amazing each day, just talking to people. And not striking up fake conversations with people so I can count time and try and convert them.
I say everyone give it a go - you get some really nice responses and you feel like a much better person for it. It feels good to be human some days!.