Putting curtain rails up in any house built pre 1970, drilling into lintels that are seemigly composed of the hardest materials known to man.
Plastic bags from supermarkets, make them 50 microns thicker, we would cram more into them without the fear of them breaking and therefore use less.
How unstackable empty drawers are...
The box of 'part used' batteries we have in our kitchen drawer that my OH likes to keep 'just in case'. How about we just use them until they are flat then replace with new ? ......
When people do not use data to prove something is fixed. If you can measure the fault to determine how big the problem is in the first place, you can measure it afterwards to prove you have fixed it. Don't just tell me 'it's better than it was'....grrrrrrrr....