Our brains are wired to interact. When we hear a question, we feel the need to answer it. So we stop and think about the question for a split second (or more).
This is why it is a lot more powerful to ask a question than stating a fact if you want people to do something.
For instance, a statement like “please swipe your loyalty card” will provide less returns than “have you swiped your loyalty card?”
Ask questions, get results!