Toilet etiquette, the household equivalent of guerrilla warfare.
User Xavier88 says: I accidentally dropped my coffee pot while cleaning it and the handle broke. My family, being hooked on the liquid, would not forgive me for leaving them without it. A couple of ideas came to my mind, but some of them got in the way until I came across these. Ever since then, nobody has noticed the fix.
User diamondchick1 bought an expensive gate with a "cat door" to keep the dog away from the cat's food (and litter box). Unfortunately, the "cat door" was more than big enough for her 40 pound Australian Shepherd to fit through. Peg board + jigsaw + zip ties = no dog in the kitchen!