http://www.slate.com/articles/technology/future_tense/2015/05/rip_trolling_how_the_internet_has_transformed_dark_humor.html

In 2012, 25-year-old James Holmes opened fire during a screening of the film The Dark Knight Rises. Twelve people were killed, and dozens more were injured. In the weeks that followed, participants around the Internet made light of the shootings by creating and sharing memes, cruel Photoshops, and myriad off-color jokes, as Kate Miltner has chronicled. Similar things happened in the wake of the the Sandy Hook Elementary School shootings, Hurricane Sandy, Robin Williams’ suicide, the Germanwings Flight 9525 crash, and the Baltimore protests. Each case inspired what folklorists describe as “disaster humor”: comedic (and often highly transgressive) responses to mass-mediated tragedy.