Just Another Perl Hacker
A signature commonly used in the Perl community. After it's introduction people wrote more and more fancy variations of it, some of which were extremely obsfuscated!
Here's an example:-
for(74,117,115,116){$::a.=chr};(($_.='qwertyui')&&
(tr/yuiqwert/her anot/))for($::b);for($::c){$_.=$^X;
/(p.{2}l)/;$_=$1}$::b=~/(..)$/;print("$::a$::b $::c hack$1.");