The quartermaster has only two sizes, too large and too small. Murphy's Ninth Military Law Never worry about the bullet with your name on it. Instead, worry about shrapnel addressed to 'occupant'. If you need four screws for the job, the first three are easy to find. The N-1 Law Negative expectations yield negative results.
Positive expectations yield negative results.
O - If you change lines, the one you just left will start to move faster than the one you are now in. O'Brian's Law Variables won't, constants aren't. Osborn's Law Murphy was an optimist. If you did manage to get any good shots, they will be ruined when someone inadvertently opens the darkroom door and all of the dark leaks out. The Third Law of Photography Nothing is so good that somebody, somewhere will not hate it.