Overheard in the office:
[Person walking into the office] "That's a nice chart you are making there, what is it for?"[Me] "A fund raising presentation for a new interesting startup."[Person] "Tell me more about it."[Me] "OK. It's not confidential. Here is the deal" [Short and sweet story follows][Person] "That sounds like a great investment opportunity"[Person leaves the office][Me thinking] "I need to re-write this presentation from scratch..."
Sometimes the best presentations get created after the work is basically finished. All the pieces of the puzzle fall in one place. There is nothing wrong with opening up a blank screen and re-writing the entire deck in one big burst of creativity. It would not have been possible without the time spent on the first version.