Unlike BooK, I am not a specialist obfuscator. However, for cheap thrills, I had a go at obfuscating the source program a little, mainly by using some of the more obscure Perl built-in variables.

sub _{system$^O=~Win?CLS:'clear';
print$"x+abs($=/3*(2*$|-$-)),$_,$/for@_;sleep!$%}
open$%;
chop,y,!-~,#,,s,(.).?,$+,gfor@~=grep$|--,($|)x18,<0>;
@;=map~~reverse,reverse@~;
($-=--$_%3)||(--$|,map$_=reverse,@~,@;),
_!!$;&$-?@;:@~for$|..!!$;.$^F
[download]

Is the $|-- idiom well-known at Perl monks? Where is its behavior documented?