My cow-orkers mostly...
Write Perl code in their basements at night (if indeed at all) and never let their code see the light of day. Perhaps they'll run a newsletter or a blog from home servers. They'll use it for system maintenance & all kinds of utility purposes on their Linux & FreeBSD boxen that they keep hidden away and never ever speak of in the office...
Back in the office - in the land of Windoze desktops, cube forests, waterfall development cycles, and unsurmountable feature creep...
If someone mentions it in their presence they will over-compensate with criticism thinking someone is trying to out them.
If someone actually USES it in PRODUCTION - alas in their extreme jealousy - the Inquisition begins.
On the bright side: the Inquisition came before & fell upon the necks of the .ASP'ers & VB'ers.
Fortunately I started learning Java shortly after learning Perl - always chasing that Holy Grail of Platform Independence... So I find myself WITH a job. Provided they stay out of my basement... :-\
Wait! This isn't a Parachute, this is a Backpack!