"The Club", and how close they came to raping Twilight, Rarity, and Octavia.
Three Nights at Freddy's
All of theoriginalgames - involving killer animatronics - is Nightmare Fuel in and of itself. And any crossover with it is no exception.
Shinzakura has stated, however, that 3NAF is "semi-canonical":
Shinzakura: "Its semi-canonical. Officially, there was a fight that destroyed a Freddy Fazbears restaurant in Sunnytown. But that was due to Les SCARS who were trying to scare off Shim, Sham and by extension, Adagio, so they could continue to use it as a firebase against SIREN. The more horrific and magical parts of it relating to the FNAF franchise arent official to the BV, however."