I made a shirt like that years ago, it's still up on Zazzle. I've never advertised it, I never ordered more than the two I initially intended the design to be for, yet it still turns about $50/year in random sales.
I like it, but maybe make it a bit more subtle - remove the @ and possibly also the <p> element.
tnx starstreak do you think most will still get it then?
I dunno, I think most people among the t-shirt's target audience dig more "subtle" and "clever" humor, but maybe it's just me. Try it out and see, that's the only way you'll know :)