You must realize that you are 54 years old, and I have certain
needs which you are no longer able to satisfy. I am otherwise
happy with you as a wife, and I sincerely hope you will not be
hurt or offended to learn that by the time you receive this
letter, I will be at the Grand Hotel with my 18-year old teaching
assistant. I'll be home before midnight.
When he arrived at the hotel, there was a faxed letter
waiting for him at Grand Hotel desk that read as follows:
You, too, are 54 years old and by the time you receive this
letter, I will be at the Breakwater Hotel with the 18-year old
Since you are a mathematician, you will appreciate
that 18 goes into 54 more times than 54 goes into 18.
Therefore don't wait up.