Since I am Asian, I am always very tempted to say "me no speak no English" after the flight attendants give the briefing. It is really a safety matter that has to be taken seriously so I never worked up the guts to do it.
Imagine if someone who does not understand English fails to help with a proper evacuation and causes people to be trapped in a burning aircraft!
I think it is great when flight attendants strictly enforce safety related rules. Usually, I have a problem with them not doing it.