Here's an excerpt from a review by A.O. Scott of "The Imitation
Game" (the new film about Alan Turing) that appeared on November 28,
2014 in the New York Times:
"The Imitation Game" is rated PG-13 (Parents strongly
cautioned). Illicit sex, cataclysmic violence, and advanced
math, most of it mentioned rather than shown.
I guess advanced math is pretty disturbing. Parents, watch
your children lest they become mathematicians. :-)