"If you buy just one of something, you will surely break it almost immediately, but if you buy one or more "spare" items to have "just in case", your "initial" item will miraculously escape damage no matter how many mishaps you endure, and thus those duplicate items will merely gather dust in the garage or at the back of your desk-drawer."
I have always tried to handle objects gently and carefully, but due to extreme forgetfulness and physical/mental/emotional infirmities, I tend to "be rough on my stuff" --- sitting/stepping on unobserved items, blundering into objects as I'm groggily stumbling to the bathroom in the middle of the night, soiling items or spilling/dropping stuff, etc., and so I occasionally attempt to "prepare for the future" by acquiring spares of the types of items which I typically seem to damage or break; only prob is that just as soon as I do "lay in for a rainy day" like that, the "currently-being-used" object that I had been procuring said spares for NEVER SEEMS TO ACTUALLY SUSTAIN SIGNIFICANT DAMAGE, and so all of those extras that I'd carefully tucked away just "sit there for decades"... talk about a classic case of "Murphy's Law of Spares"!
"If you leave your vehicle's engine running during a delay in proceeding (traffic-jam, road construction, accident-resolution, "stuck" red signal-light, etc.), you will be sitting there for many minutes, just wasting gas. The instant you turn the key off and climb out of your seat to stretch, however, THAT'S when the line of traffic will begin moving again, and thus you will have shut off your engine "for nothing", AND you will now be holding up everyone behind you while you hastily hop back into the driver's seat and re-start the engine so that you can move forward again."
I finally took da plunge and bought a second-hand Toyota Prius because I'd eventually had one too many cases of Murphy's Law of Engine-Idling Duration... the Prius automatically shuts down its power during stand-stills, and then uses its electric motor to provide instant mobility as soon as you're ready to go again.
"You can sit around at home till Doomsday and the prices at the pumps will stay fairly low, incessantly tempting you to travel. But the moment you decide to take off somewhere and head out on your trip, the price for a gallon of gas will go right through the roof!"
Gas-prices seemed fairly "stable" all summer, and so I delayed a road-trip for a while to "save up" or "accumulate" a number of errands so that hopefully my trip would be more cost-effective with regards to gas-consumption, but then when I stopped to fill up my tank in the morning when I was first heading out, the price had suddenly jumped over a quarter higher per gallon! Sounds like a classic case of "Murphy's Law of Gasoline Prices" to me!
"You can hold onto something for decades, and neither you nor anyone else will ever have a use for it, but then just as soon as you throw it out, either you will suddenly need it for something, or --- even more 'painful' --- **someone else** will come to you and humbly ask, 'Do you happen to have an extra ___?'" Rrrrrggggghhhhh----!!!
I'd had a couple of old 55-gallon oil-drums stashed in da garage for da past thirty years --- my grampa had given 'em to me when he and Gram were downsizing to move into an assisted-living apartment --- and they'd just sat there and gathered dust in da corner all that time. But then just two days --- TWO STINKIN' DAYS!! --- after I'd sent 'em to da crusher for recycling, a low-income neighbor dropped by and asked me if he could have them to use as burn-barrels --- guess dat was a classic case of Murphy's Law of "Junk" at work!!
"You can follow an 'unpopular' method or procedure 'till da cows come home' and nothing unusual will ever happen to 'justify' or 'vindicate' your unorthodox actions (and you'll likely get continually criticized by others for your chosen behavior), but then the ONE TIME when you eventually 'cave' and actually DO happen to follow the 'standard' or 'acceptable' protocol, THAT'S the solitary 'rogue occasion' when disaster will happen to strike --- something really bad will happen that would not have occurred if you had simply continued to follow your own 'pet' procedure that had seemed better/safer to begin with!"
My "super-long-term-driving-experienced" aunt had gotten fed up with my "back-seat driver" attempts to be helpful by telling her about vehicles that I'd see moving around fairly near our position when we'd be travelling someplace in her car, and so she had eventually asked me to just keep quiet and let here handle the driving herself. Well, of course, within a day or two, Murphy's Law of Exceptions decided to turn and bite me in da butt --- due to a view-obstructing sidewalk-mounted ad-sign, my aunt didn't notice an approaching car, but I did... naturally, that was the ONE TIME that I **didn't** tell her about it because she'd specifically asked me to keep my trap shut on instances like that, and so I'd ASSUMED (there's that word again!) that she'd observed the vehicle bearing down on the intersection. Well, as you might expect, we crashed, and there were multiple injuries in the other car! Can't win...!
"No matter where you stand, da breeze will invariably blow either towards you or in your face, causing you great difficulty in proceeding ahead and/or "cleanly"/effectively performing tasks dat involve/include vapors/particulates/liquids." (Think, Murphy's Law of Cigarette Smoke, or trying to bicycle someplace on a blustery day and da stiff wind keeps switching around so dat it's always hinderingly in your face --- never helpfully at your back --- both on your way to your destination AND on your way back home again!)
P.S. Oh yeah --- and don't even **consider** simply postponing outdoor activities till a "still spell" --- DAT will only mean multitudes of mosquitoes and black flies to torment you and make you WISH for a breeze!
Two classic examples of da infuriating effects of Murphy's Law Of Wind-Direction would be (1) trying to water your hanging-basket plants on da front porch, but da watering-can's sprinkled droplets keep blowing backwards so dat da water both largely misses your plants and gets you soaking-wet, and (2) trying to employ toss-across collecting when gathering returnables along da highway, but having many of da thrown containers just blow right back onto your side of da road.