I was looking around shirt on Snorg Tees and came across a few that made me laugh a lot. Click the images for where you can get the shirts if you like:
Tons more on their homepage. Lots of them are a bit more pop culture references.
I also like the gender classifications on their site, and the icon they use for your cart.
(Note that this is not me asking for these in any way, shape, or form. I have way, way more t-shirts than I need already. Just pointing out good comedy on the web.)