So a man goes into a restaurant to use the restroom. He comes back half an hour later. The manager comes up to him and asks what he was doing and the man says "blowing bubbles" and walks out.
About an hour later another man comes in to use the restroom, he is also in there for half an hour, the manager asks this man the same question, to which the man replies "blowing bubbles" before leaving. An hour later another man exits the restroom, the manager says "let me guess you were blowing bubbles" to which the man replies "no, I am bubbles"