Maybe we haven’t all experienced exactly this, but I guarantee you know a couple people who have. I have a friend who thought that a vending machine was called a “bending machine” (because you have to bend over to retrieve your delicious snack) until, I kid you not, senior year of high school. Needless to say, we laughed a lot when we figured out what she was talking about.

But you know what? These 15 AskReddit users have maybe even got her beat!

1. You spilled a lot of soda unnecessarily 

When I figured out that you could simply close the cap again when a soda was about to fizz and explode. I always thought that you were just screwed and I would try and run to the nearest sink.

2. Che Cosa Fa’?

When I picked up my knife to cut spaghetti at my first dinner with my Italian in-laws.

Everyone dropped their fork and stared at me.

3. B is silent in “dumb” too

I pronounced the silent “b” in “subtle” until my friend looks at me and says “…..Um, the ‘b’ is silent…..are you okay?”

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4. …wait, what?

When I went to an adult dentist for the first time they said it looked like I don’t floss at all and I informed them I floss all the time. They had me show them how I do it. They then immediately showed me how to do it properly. I had no idea you could go between the gums and the tooth, I had always just gone between the teeth themselves.

5. Also not something I knew

I’ve had long (steadily growing longer) hair since my last year (maybe two) of high school, when I stopped going to a school that had a strict dress code. It could easily take me 20 minutes or more to finish brushing all my hair.

Someone on reddit commented on a picture of Rapunzel something like “she brushes her hair from the top down to the ends. Everyone with long hair knows that you start at the ends and work your way up! That is the one thing I don’t like about this movie, and from a studio that usually pays such close attention to detail!”

…So now it takes me a minute or two to brush my hair.