The System

Each Friday night Bill drove his wife to the train station so she could go visit her sister who was ill.

Ten minutes later, Bill’s sister arrived by train so that she could look after the kids while Bill worked over the weekend. On Sundays this procedure worked in reverse with Bill’s sister departing by train ten minutes before Bill’s wife arrived.

One evening after Bill’s sister left and while he awaited his wife’s arrival, a porter sauntered over.

“Mister,” he said, “you sure have some system going! But one of these days you’re goin’ to get caught!”.