Screenplay update

I finished my screenplay and now I'm back at the coffee shop where I wrote it contemplating my next one. I had this really brilliant idea for a comedy, which would be different for me, because I always end up writing more serious than I intended. The brilliant idea lay fallow for more than a month, and now I look back at what I wrote down as an idea and wonder why I was so excited. It's as if I didn't write down the most hilarous aspect which I now can't remember. Frustrating. If I came up with it once, I am not confident that that means I can come up with it again. I is an idiot.