Uhoh...
...you've probably already seen most of these, javabill , but it's worth it just for the laugh factor. I think xspliffx would get a laugh out of it as well (being that she works in the tech hell mines). Thanks to xanthrant who I shamelessly stole the link from. :)
http://major-error.net/signs/
Enjoy! (I am too lazy to go back and code that as a hyperlink by hand.) Lazy woman!