I saw this guy somewhere around Capitol Hill while riding bus 96 towards the RFK Stadium last Sunday on my way to a party with Ukrainians. My friend and I were just discussing beers and thirst, when we saw him. Unfortunately, since we were in a bus, we could not give him any money just for being creative and funny. Obviously, he was happy with himself as well (look at his face).
I have seen pictures like this one on the web before. However, this is the first time I witnessed such an honesty myself. My Californian friend told me that such signs are quite common there. They might be common in Eastern Washington, DC, as well, but I do not go there without absolute need, even though it is an awesome place to take pictures (especially candid portraits).