Also, in response to this:
... I'd point you over here, which breaks it down nicely. In short, when it comes to "Zombies are People, Too" it can go either way. As per the suggestion on the linked page (The Grammarphobia Blog), the comma is best used in this situation to greater emphasize the "too", which is absolutely the case for the Zaphod Zombie slogan.
... the comma tends to look out of place. I stand by keeping the comma, but perhaps in the revised shirt coming with the Dawn of the Thread campaign, I might off it. Keep it in the written phrase, but for the purposes of T-Shirt simplicity, cut it out.
The anguished musings of a jack-of-all trades creative professional based out of Longwood, Florida. Find out more about him here. You know, if that's your 'thing'.
Most of my production music is original but if I need something extra-special, I usually get it from AudioNautix.com: