The chances the elevator isn't work is inversely proportional to the weight you are carrying multiplied by the number of stairs you'll have to climb.Quote by Edward A. Murphy about chance, numbers, work
The squeakiness of floorboards is directly proportional to the need to remain unnoticed.Quote by Edward A. Murphy about need
The time you have to wait before going to bed increases proportionally to how tired you are.Quote by Edward A. Murphy about time
Good luck is inversely proportional to good timing.Quote by Edward A. Murphy about good luck, bad luck, good