What people who don’t write don’t understand is that they think you make up the line consciously — but you don’t. It proceeds from your unconscious. So it’s the same surprise to you when it emerges as it is to the audience when the comic says it. I don’t think of the joke and then say it. I say it and then realize what I’ve said. And I laugh at it, because I’m hearing it for the first time myself.
Whenever I find myself in a bout of non-writing (not writer’s block per se, but an extended period of non-writingness), I know it’s this. Not a lack of ideas, not a lack of the right space to write, the right drink, the right order, the right methods, the proper instrument, not a deficit of time. It’s simply my conscious getting in the way. I would be better off saying things more wildly, then looking at what I’d said. Do first, think later; many things can benefit from this method — falling in love, taking your first job, speaking up for what you believe in. Write first, think later. Repeat.