Grave of the Fireflies
On 25 December 2016, Toei Company made a Twitter post that read in order to promote an episode of "Kamen Rider Ex-Aid". The hashtag became popular but Toei deleted the tweet after receiving complaints that referencing the "Grave of the Fireflies" line was in poor taste. Before that, the ranking website Goo's readers voted the film's ending the number 1 most miserable of all anime films.