Check out Davewear.com. Here's the blurb from today's paper:
Have a happy and merry Dave
How goofy is it? Not at all if your name is Dave. An online company, davewear.com has taken "Dave" used in sayings where "day" would appear and slapped them on T-shirts.
Hence, "Dog Dave Afternoon" and "Bad Hair Dave."
This Tsawwassen company is loony enough to hire only men named Dave, and small enought to have only two T-shirt colours and one style-black or white and short sleeved. The tees are intended to fit tight (the better to see "On the first Dave of Christmas," et al.) and sizes run from small to XXL for men, and small to large for women (named Dave, presumably).
Price: $29 plus shipping at davewear.com