I think it's worth mentioning in your POD that it's wisest to test code both with and without forking enabled, if your platform supports it. Enabling forking is a better test of each piece of code, but disabling forking is a better test of how they interact in a real script.
One might even go so far as to say that differences between the two sets of results should throw up yellow flags. (Maybe expected, maybe not, but certainly the place where algorithm analysis should be focused.) The average scripter may need you to include this short summary of your original point. ;-)
BTW, I love the title for this thread. Almost, but not quite, vulgar. :-D