Peer pressure, definitely.
in reply to I first became interested in Perl because...
Several years ago, some guys at a company I worked for in Sydney decided to setup an internal IRC server. So everybody in the office would chat away on IRC everyday (this was before IM became popular).
Anyway, the "haves" (those that knew Perl) would be forever showing off in front of the "have-nots" (those that didn't) by pasting their fancy one-liners into the IRC channel.
Eventually it got the better of me and I had to get into the act. I still can't write a decent one-liner to save myself, but hey - it's been fun :)