One of the "top sellers" at t-shirthumor.com. Found at White Knuckled Wanderer.
(That same blogger, Bill McNeal has an interesting item about how Fairfax County, Virginia, back in the '60s, screwed up their chance to benefit by the extension of the Washington Metro, and they're screwing it up again. By putting an elevated transit line down the middle of the freeway, they made it impossible to create dense development around the transit stops, which means the Metro line does less than it could to alleviate traffic problems.)