10 steps to becoming a Perl Ninja (idea) by ariels

Write subs that modify their arguments via direct modification of @_.
The Perl constructs for looping are called map and grep. Nesting them is encouraged, as long as one of the levels uses $_ as the loop variable. Recursion is also useful.
However, while and for may still be used as statement modifiers (perl -wle 'print for (1..10)').
do may be freely used. As long as it isn't paired with while.
The Perl constructs for conditional execution are || and &&. Both may freely be mixed with and and or if doing so saves parentheses.
if is permissible only as a statement modifier.
unless is permissible either as a modifier or if an else is included. But obviously not both.
$x, @x, %x, &x and X are all different; if you use one, you must use them all.
Regular expressions.
Use prototypes to make your subs more like builtins. Then use &sub to override this behaviour.

Stupidest thing you've coded just to see if you could	CPAN	Learn C, you hippies	The REAL Obfuscated Perl
listen (a perl poem)	Ninjitsu	readable perl contest	Learning Perl
perl monks	obfuscated perl	Perl	regular expression
@_	Only perl can parse Perl	prototype	uncanny
$_	Discworld	Winning a Guess-Your-Age contest	English
egrep	Map