Plastic Cup Lids
If you like coffee or tea, this one will certainly surprise you. The plastic lids of throwaway cups are designed to serve as coasters. Of course, if you want to have your coffee in your car on your way to work, this is inconvenient. If you are the type of person who sits down for it, though, this is a revelation.

Plastic Cup Lids
Holes In Padlocks
Padlocks are essential, but what is the purpose of the hole at the bottom? When water gets inside, this feature permits it to escape. Many of the locks are located outside, making them vulnerable to the elements. When it’s stuck, pouring oil or WD-40 through the same hole can assist.

Holes In Padlocks