http://tvtropes.org/pmwiki/pmwiki.php/NightmareFuel/XMenFilmSeries
This is based on opinion. Please don't list it on a work's trope example list.
Following
Nightmare Fuel /
X-Men Film Series
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This is what happens when a regenerative mutant and a
nuclear bomb mix.
With
three R-rated films and
one straight-up PG-13 horror film, there is no shortage of horrors to be found in the
X-Men universe. That's not saying the rest of the series aren't full of
Nightmare Fuel, since this is a universe where a group of people are harassed, attacked, and threatened with genocide on a daily basis
simply because they are different.