I'd say that if you will take two people, one of who is native English speaker, and another who is not, and then you will give them both the staff from Perl Poetry to read, then one of them will have much more clue, than the other. :)

Staff like "if","then","else" for example, can make a lot of difference just by itself. "while" and "until" are two other examples. "call", "require", and "use". "chop", "length", "pack". I can continue for a long time... :)

Leonid Mamtchenkov