Depression is like a bruise that never goes away. A bruise in your mind. You just got to be careful not to touch it where it hurts. It's always there, though.
That was when Leonard realized something crucial about depression. The smarter you were, the worse it was. The sharper your brain, the more it cut you up.
They thought depression was like bieng 'depressed'. They thought it was like being in a bad mood, only worse. Therefore, they tried to get him to snap out of it.
They made us participate in their own madness, because we couldn't help but retrace their steps, rethink their thoughts, and see that none of them led to us.
We're all well-acquainted with depression, we all know what the low moods are, but the mania was not something I knew much about. I didn't know that it would make someone dress extravagantly or start to pun, and to stay up and drink.