Nothing.

I have bad days and good days. This is true of everyone but what we think of as a bad day might be different.

A bad day for me can only be described in terms borrowed from science fiction. Waking up on a bad day is like lurching into a different world, one with a hostile atmosphere. The air is difficult to breathe. Familiar shapes appear distorted. Everything is tinged darker, everyone seems shrill.

It is difficult to talk to people because they seem to occupy a different universe in which things are funny, in which things make sense. Anyway, my mind seems to be a beat behind everyone elses, so it is easier to keep quiet.

Keeping quiet usually does not help though. The worst part of a bad day is the feeling of being displaced, of floating through the world without making any mark on it. Of being disposable. Just nothing.

This is what a bad day is like. But the trick is, you live it, and then eventually there is a good day. So in the end, not much different from anyone else's bad days really.