I would ask people for demonstrations of Perl's great utility, complete programs and perhaps a brief explanation of them. My brain is numb so I won't give any code but things like:

• a command line program that would change "black" to "regular" if followed or preceded by "coffee"
• a program to check the state of the S&P500 and DJI

I would ask people what brought them to Perl. And of those there will some who say "It was just so handy to do XXX." I would look for the common XXX and proselytize by using them. It could be neat to have the code outside and the explanation viewable on the far inside.

I am not suggesting any obfu, I think a few or more complete and reasonably clear programs could fit on a 12 ounce mug.

I also like some of the insider Perlism's proposed but I don't know what suits your audience.

Be well,
rir