Just listened to a client speaking about a new project which they would like to have developed, and during a scoping meeting this was said - really priceless:

We haven’t worked this out now. Having said that, it does not need to stop the development. The development just has to be open so we can choose to go one way or the other.

This was said of a requirement which is akin to me saying I want to buy a car or a plane, I am not sure yet, but it does not have to stop the manufacturing of it.