Just before I went to my first conference, I thought, "Hey, I guess I should be professional now!" and printed out business cards on the best card stock that I could find at Staples. Apparently, of the hundreds of people who attended NIPS that year, I was the only one who had done this. I handed out one card, received none, and assumed that everyone must just Google each other after the conference.
From an objective standpoint, from the perspective of maximizing the efficiency of scholarly communication, this is of course ridiculous. The only explanation that I can imagine is reverse snobbery, the same reason we would never wear a suit and tie to work. But at the time, I didn't worry about this. I just did what everyone else did.
I'm eleven years older now, and my memory is much worse. At the last conference I attended, I thought, "Hey, wouldn't it be great if next time, I could go home with a list of every new person that I met, perhaps on a durable but unobtrusive slip of paper?" I do worry about people giving me funny looks, but I can't very well pretend to myself that I am creative and iconoclastic if I always do what my friends do.
So if I meet you at NIPS this year, do not be surprised if you receive an unobtrusive slip of paper from me. I hope that you enjoy the word cloud on the back.