You probably think you're pretty smart, but this list is guaranteed to make you kick yourself. There are just so many things we use every day with insanely clever double uses that we had no idea about.
1. Pan Handle
Need a place to rest your spoon when you're not stirring your sauce? You already have one: the hole in the end of your pan handle.
2. The Hole In Elevator Doors
Don't worry that people are snooping on you while you're riding between floors, this is just a special keyhole for emergency workers.
3. Aluminium Or Plastic Wrap Box Holes
Yes, you've probably been using the aluminum foil box wrong your whole life, but that's okay: you're learning now. Fold in these little tabs to lock the roll in place.
4. Hole In Your Pen Cap
Be glad you never had to find out about this one! Pen caps are one of the most common things people - especially children - choke on, so they've been designed not to block your airway.
5. Colorful Bread Tags
You may think the color of your tag is just random, but really it's part of a secret code. Each color represents a day of the week, so you always know when it was delivered to the store. Normally the days are in alphabetical order (Monday is blue, Tuesday is green...) but each company is a little different.
6. Plastic Lid Cup
If your local cafe gives you a plastic cup and lid, or you buy some from the store, you're actually getting a free coaster too. The cup is designed to fit perfectly onto the lid and keep your tables looking like new!
Keep reading to learn more secret uses, including one hidden in your ketchup bottle!