When you and a friend are replying to e-mails at such speed it looks like the two of you are chatting on msn. Must happen accidentally, at the risk of being a bona fide nerd.
Phil receives e-mail from Alex: ''Waddup man, let's kick it this weekend.''
Phil, replying: ''Cool, let's go to this bar I like.''
Alex, replying: ''Aight, let's meet at my place.''
Phil: Mmmh, e-mailsn moment.