I have plenty of these!
I was sitting with a group of friends in 12th grade, and one of them was having a birthday coming up. It is well known that the girl was pretty sexual, and one of the my friends joke that he was going to give her a dildo. That made everyone around laugh except me because I didn't know what a dildo was, and I ask them. They all took one look at me, laugh, and my best friend next thing me to me grab me and gave me a hug because of how naive I was, then she explained it.
In eleventh grade, a speaker came to talk to us about writing good papers, and she made the entire class arrange their desk in a circle around her. She ask us to write a short but descripitive paragraph on where you will go for a perfect romantic moment, and I wrote about going to a park just because I like the idea of hanging around nature and just loving each other company. We had to read aloud what we wrote, and to my horror, everyone was describing a moment similar to a honeymoon. They were describing the suite they were going to stay in, the candles, the smell, bascially where they would love to have sex in. The first person who started describing their "honeymoon" like romantic place, I remember thinking "too much info, that is not what she was talking about when she said romantic." Then everyone begin describing similar things and I finally understood that I was the wrong one. When it was my turn, I was very embarressed and told her I didn't get what she meant by "romantic", then I proceeded on telling her what I did have. She look disappointed and told me that I must always try to understand the prompt. This was before I found out about being asexual, so when it happen I was left confused by how different I saw things compared to my peers.
ETA Me and my mom was watching a Japanese drama called "Your my Pet" and in the drama due to some unforunate circumstance, the main guy had no where to stay and convince a women to let him stay with her and she would only let him stay if he be her dog and nothing else, which he gladly accepted( yeah, it sounds strange, I know). Throughout the drama they became very close, and the women, who normally was very reserve and didn't show her feelings, begin to open up to the guy and show her true personailty, something she rarely show to others. She cried in front of him when she hated crying infront of people, and let him hold her too. To me, this signified her falling in love with him since that is they type of relationship I've always wanted. My mother disagreed due to throughtout the drama, the women also wash the main guy hair while he was taking a bath, you know, being the owner and all. My mother said a women in love would have a hard time doing that, and tried to explain to me that the women should be feeling some "tinglingly." I didn't get that at all since this was before I found out about sexual attraction.