When you look at the designs of certain items, you might be thinking that certain features can't just be there for show. And if you've thought that, you're right. Companies love to put hidden tricks in their products to help make them easier for those in the know; check out these common examples!
Giving George a Haircut

Back in the old days, people would try to skimp on paying taxes by clipping their coins, taking away precious metal in the process. That's why ridges were added to the coins: if the ridges weren't there, merchants knew that the coin had been clipped and wouldn't take it!