I email my friend, who sits next to me, reasonably often...
That's mainly because the woman who sits opposite me will listen in and then quiz me on the details of the conversation later.

Or the guy who sits opposite my friend will listen to our conversation and then chip in with "the best one was..." and tell some hilarious anecdote about how he's done whatever it is we were talking about, but better, or drunker, or before it was all the rage, or something...
(Professor Kenny Martin Hmm? What?, Thu 8 Mar 2012, 10:05, Reply)