Thought an orgasm and an organism were the same thing.
Gave an entire speech to my class at 13 years old, first month at a new school, about how I wanted to be a marine biologist and work with marine orgasms. Everyone was laughing and I didn’t know why. The teacher didn’t say anything just laughed along as well. A girl I’d just made friends with had to fill me in after class.
Turns out, they are definitely not the same thing.