A young couple that had received many valuable wedding presents established their home in a suburb. One morning they received in the mail two tickets for a popular show in the city, with a single line:
"Guess who sent them."
The pair had much amusement in trying to identify the donor, but failed in the effort. They duly attended the theatre, and had a delightful time. On their return home late at night, still trying to guess the identity of the unknown host, they found the house stripped of every article of value. And on the bare table in the dining-room was a piece of paper on which was written in the same hand as the enclosure with the tickets:
"Now you know!"