This isn't my own creation, but I couldn't find it shared here yet.
It is a poem:
< > ! * ' ' #
^ " ` $ $ -
! * = @ $ _
% * < > ~ # 4
& [ ] . . /
| { , , SYSTEM HALTED

It reads as:
Waka waka bang splat tick tick hash,
Caret quote back-tick dollar dollar dash,
Bang splat equal at dollar under-score,
Percent splat waka waka tilde number four,
Ampersand bracket bracket dot dot slash,
Vertical-bar curly-bracket comma comma CRASH!