What annoys me is the passengers who stand up and start trying to get bags down etc when the plane hasn't even left the active runway (or taxi-way). One day someone is going to get seriously injured. I get annoyed that the crew dont shout loudly at the person to sit down until we have come to a complete stop (like they do if you are on an Australian or US carrier).
I mean, do they think they are going to get off any quicker?
I also don't get why people can't seem to clean up after themselves in an aircraft bathroom. It's not that hard.