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.  :-)