Max arrives, his tongue hanging out of his mouth. Paul awaits him, clipboard in hand.
Max: Thiiiirsty! I neeeeed a beer!
Paul: Quick survey! How do you feel right now?
Max: Go away! I need a beer, now!
Paul takes some notes and asks: Would you say you are happy right now?
Paul: Or would you say that you are not happy now?
Max: No, thirsty! Beer!
Max opens a beer: Finally! Beer!
Paul: And how do you feel now?
Max: Aah... great!
Paul: That concludes the survey. 100% of the participants were happier with beer. That proves: beer drinkers are happier!