Apparently, this little poem has been around since at least 1990, but this is the first time I've come across it. First, the written version:

<> ! * ' ' #
^ " ` $ $ -
! * = @ $ _
% * <> ~ # 4
& [ ] . . /
| { , , SYSTEM HALTED

Doesn't make much sense, does it? Now, if you realize that angle brackets, according to readers of InFocus magazine, are pronounced "waka" and an exclamation point is often called a bang, well then you get this wonderful version when read aloud:

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

Yeah, it's geek humor, but I love it.
(Link and poem courtesy of Diveintomark)