I had a brain fart when talking to a new coworker and couldn’t remember her name. She was very attractive, and this had clearly never happened to her before. She became very agitated and upset about it. (She wasn’t a b*tch or anything, just unaware of the benefits she got from being pretty.)
I was always nice and respectful to her, but for the rest of our time working together, I continued forgetting her name and it drove her nuts.