Depressed people tend to gravitate to other depressed people, and somehow they expect the other depressed people to make them feel better. The sick thing is that about half the time it actually seems to work. Which makes it all the more depressing the fifty percent of the time that it doesn’t work.
Why does it work at all? My theory is twofold: a) for some reason depressives are more responsive to and aware of humour, particularly the sarcastic kind, and b) intelligent people are more likely to be depressed and being intelligent, they are also easily distracted by intellectual matters.
Or whatever. Antidepressants work better, but they never introduce you to new bands or authors or anything…