18. The little hole in your padlock.
Growing up I always thought this is where the lock could be picked from.
But actually, it is only for you to oil up the lock when it starts to get a little rusty and old. Who would have known?
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19. The tab on your soda can.
No, it was not created to break off and then launch across the room at some target. Although that was fun that’s not the proper use at all.
If you spin it around you can use it to hold your straw in place. Who would have known!
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20. The plastic on the inside of your soda cap.
Although we remember this as where to see if we won something but actually the real use for this is much different.
That little plastic disc is actually used to keep the beverage from going flat. Well, we are sure happy they figured this one out.
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