Exactly one week ago, I walked into Seattle's Scarecrow Video and asked the person at the counter if they had any documentary DVD's on China's Three Gorges Dam available for rental. The person at the counter checked their inventory as well as several commercial databases, apologized for the fact that they didn't, and told me that he'd ask their buyer to correct that state of affairs. Yesterday, I got a call from them saying that they'd just purchased two documentaries on the Three Gorges Dam as a result of my request, and they'd hold them both for me until I could come in.
The amazing thing here is that to them, I'm nothing special: I haven't rented an extraordinary number of films from them, and they don't know me personally. This is just what they'd do for any customer whose request happens to reveal a weakness in their rental inventory, the maintenance of which they're personally passionate about.
At the risk of sounding gushing, like Beethoven, Musashi's on 45th, and the iPhone, Scarecrow Video is one of life's rare examples of something that's better than it actually needs to be. If you live anywhere near them, you have no excuse to rent anywhere else :)