You thought up an idea. It was a great idea. An idea that would live on for generations; something that someone looks back on and thinks, "Damn. That was a good idea." The only problem is you can not remember it.
The tower fan's buzz matches the feeling of the short breeze every five seconds as it oscillates quietly; overpowered only by the slightly stronger hum of the central air unit. Where am I going with this? I don't know because I forgot to write notes when I started this draft.
Write it all down.