A poem that is approximately a valid Perl program (but then, so is most keyboard mashing). Modified from: http://poetry.about.com/od/poetryplay/l/blwakawaka.htm

wakka-wakka

< > ! * ' ' #                     # Waka waka bang splat tick tick hash,
^ " ` $ $ -                       # Caret quote back-tick dollar dollar dash,
! * = @ $ _                       # Bang splat equal at dollar under-score,
% * < > ~ # 4                     # Percent splat waka waka tilde number four,
& [ ] . . /                       # Ampersand bracket bracket dot dot slash,
| | { , ,  Segmentation fault     # Bar bar curly-bracket comma comma CRASH.