I often tend to drink gyokuro when I'm in an off mood, whether it's angry, sad, tired, or any number of other feelings of being off. Lately I've been drinking bi luo chun under these circumstances too. In the winter, when I'm feeling off, I'm more likely to turn to a greener oolong with a very light roast.
In an off mood, I'm less likely to turn to a very strong black tea, or to a more heavily-roasted oolong.
When I'm happy I'm less picky.