Quite a few years ago, I taught a very popular Step Aerobics class on Sunday night. One Sunday, before class, one of the male participants told me that he would be missing class next week. As my usual response, I said, "Okay." He informed me that he was going to be watching the Superbowl.
I politely smiled and began to walk up the stairs to the aerobic studio. He followed me and said, "I bet your class will be empty next week." I turned around and said, "I guarantee that you'll be the only one missing." He paused, grinned, and said, "I think you may be right."
The next Sunday, he showed up for class. Later.