Originally Posted by canadiancow

So I've always reported it when I noticed it, but was never offered a green form.

I still haven't emailed about my second incident, but I'm sure even the MUC concierge would back up my claim. It was known before the door closed.

That being said, if you're not reporting it on board, you're not helping the next person to sit there. No, it's not your responsibility, but it's still a nice thing to do.