There's nothing quite like going through one of my depression spells while working the register at work. I ask a customer how they are, they say "Fine, and you?" and I lie and say I'm fine, too.
Still, these little pleasantries are occasionally replaced by a customer saying how they're really feeling. They have a relative who is ill, or they're going through a bad patch. And part of the job ends up being to put myself totally aside and listen for a bit.
And that somehow makes the depression ebb just a little.
Even so, it felt good to get home and try to take a nap.