No, it's not a joke.
There really is a rare, Chinese tea called "yellow tea," and it's absolutely delicious. It's between a green and white tea, in terms of processing, and the taste is smooth, clean with a slight hint of smoke and mystery, like the first European you met when you were a little kid.
The leaves are harvested in the early spring and undergo a gentle steaming, which differentiates yellow tea from the typical green-tea process and produces a sweeter, lusher brew (just imagine what you'd be like after a day in a sauna- no doubt, glowing and far more pleasant to be around). I'd definitely recommend it for green-tea avoiders, or anyone looking for a smooth but full flavor.
The type I found at Ito En is called Hou Shan Yellow Buds, and at $15 an ounce, it's not for every day. Once you taste it, however, you'll see it's well worth the price.
The pale golden color you see in the photo belies its rich taste and sweet fragrance. And yes, you can get right back in bed after you make yourself a cup.
Finally, yellow does happen to be my favorite color, and statisically, it's the rarest one for people to pick as theirs. (I'm not a mathematician, but I do play one on TV.) Whenever I come across a fellow yellow, they're in my life for good. Luckily for my misanthropic nature, however, that doesn't happen often.