We subconsciously use hypotheses everyday. A hypothesis is simply the identification of a particular assumption, and the prediction of the expected outcome. Sound complicated? It isn't. All types of decisions have implicit assumptions and hypotheses behind them.
Sometimes I just want to click on some text on a website and start editing away. So I do. For example, when I'm with a client and I want to demonstrate how they can improve the copy on their website, rather than just telling them, I can show them by editing their website on the fly. It always grabs their attention, even though it is a very simple trick.