â€˜The rule is, jam to-morrow and jam yesterdayâ€”but never jam to-day.â€™ â€˜It must come sometimes to â€œjam to-dayâ€,â€™ Alice objected. â€˜No, it can't,â€™ said the Queen.
(Lewis Carol, Through the Looking Glass)
When can you get Wally to work? Yesterday you should have; tomorrow you might; but he'll never work today!