Small Hole On Ballpoint Pen Caps
The hole in the cap is there for a vital purpose. If you accidentally swallow the cap, the hole will allow air to flow through. It might seem odd, but you’ll be surprised how many people put those caps in their mouths.
Indentation Under Wine Bottles
If you enjoy drinking wine you would have noticed that there’s an indentation at the bottom of the bottle. It’s called a kick-up or punt and it helps stabilize the bottle. It ‘s also useful for pouring, as you place your thumb in the indentation.