What silly, embarrassing, etc. "sins" have you committed as a writer?

I feel like we've all done something stupid at some point, so let's talk about it.

I'll start: when I was 11, I found a book (popular and used in schools) and I really liked one scene... so I copied it with the names of my OCs and, very proud of myself, I decided that no one would notice. Yeah, well, people noticed. It turns out that changing the names won't hide the fact that your text changes from "she was dressed like in this picture and wore this hat" to serious writing by adult man from a different era.