Come and See.

I like the answers people listed here, HOWEVER, none of them can be compared to Aleksei Kravchenko who played as a kid in a Soviet WWII horror war movie:

He was taken to a psychologist from time to time to make sure if he is mentally stable. Even this movie requires much care for child as he is willing to continue. He later starred in other movies: The Star, Spetsnaz, 9th Company, Attack on Leningrad and more.

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