You will have a hard time convincing kids that anything printed on that ugly windows command shell is impressive.

Nonetheless, maybe you could impress them with the help of something out of the Acme:: CPAN tree. For example Acme::LeetSpeak or Acme::Lingua::Pirate::Perl, i.e. translating sentences they write to pirate, leet, lolcat or any other nonsense language. Sadly the pirate module is no translator, but maybe you can access or simply copy the internal translator subroutine of the module