A man came to visit at a convent while the superior mother was out of town. He left before she returned, and was careful to leave nothing behind. The nuns said nothing about his visit, so how did the superior mother figure out that a man had been there?
Wednesday, Tom and Joe went to a restaurant and ate dinner.
When they were done they paid for the food and left.
But Tom and Joe didn't pay for the food. Who did?
Wednesday (the name of the third person in the group, not the day).