Note: 'Depression' and 'Philosophical Depression' are NOT the same thing.
(Some people who have experienced it and have overcome it claim that they've simply learnt to use the depression to their advantage. Nobody can explain how, as it is supposedly verbally in-explanatory but makes sense within experience).
*Walks past family in a window celebrating with love and happiness around a Christmas tree, walks past a woman screaming with fury at her friend*
Thinks to him/herself
"Why does everybody seem like they're acting all the time..."