I think that the "killer app" of Perl is CPAN…
Typical quotes after browsing CPAN for the first time:
"You have a library for WHAT?"
"Extirpate HTML has to be the best function name ever!"
"You can summarize text in Perl?"
Once the programmers see how easy is to do hard things, they are sold.
Then you can show them perldoc and the Camel.
