Plastic Cup Lids
If you enjoy coffee or tea, you will most likely be surprised by this one. The plastic lids of your throwaway cups are designed to function as a coaster as well as a lid. If you want to drink your coffee while driving to and from work, this is obviously not a good option for you. If, on the other hand, you are the type of person who takes the time to sit down and think about it, this is a revelation.
Holes In Padlocks
Padlocks are quite vital, but what exactly is the purpose of the hole at the bottom? When water enters the house, this feature permits it to escape. Many of the locks are located outside, which means they are susceptible to the vagaries of the wind and the weather. Alternatively, pouring oil or WD-40 through the same hole can be beneficial when it is stuck.