Which are the best extras that gave the best performance in movies?
An example would be the Asian girl in the back of Jeremy Irons meeting in Margin Call.
Or that one ewok that laments the death of his friend.
Preferably extras that don't break character completely. My hard rule would be this:
The extra that breaks laughter in life of Brian is allowed, because the in universe character soldier would be expected to break in laughter. The extra that tossed the can to John malkovich is not. The extra went completely against planed script, But they kept the scene anyway.
That extra that falls down from an non existent kick from the hero, Power Ranger style, does not count.
The Strom trooper that hits his head in episode 4 would not be allowed... While his accident would be natural, it did not come as intentional from the script, or any of the actors.