I would say: never never never do something strange and/or unusual in (with) Perl unless you're sure what you are doing (even if you just want to have fun)
As for "always", here is one I learned the hard way:
Always, always, always comment your code so that if you have to read it in three years, you would still understand what it is supposed to do...
An idea is not responsible for the people who believe in it...
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