This was an episode of curb your enthusiasm.<p><a href="https://m.youtube.com/watch?v=mPzjbXgaVOk" rel="nofollow">https://m.youtube.com/watch?v=mPzjbXgaVOk</a>
I'm a man, but I have always understood the dynamic to be completely different in (U.S.) women's restrooms. There, women chitchat with complete strangers. In that case, the current user would cheerfully respond, "Yes, I need a few more minutes" and that would be that. No embarrassment whatsoever.