I swear I saw some sort of demonic face in the fogged-up windows, but I didn't make it, no one could've made such detail in the corner, then a hand-looking thing to the left. Coincidence that I see this the night following such...
Sorry for pointlessly long comment
Erm actually Chara isn't evil, because research suggests that Chara just narrated the adventure, but it was the PLAYER who pushed frisk and Chara to being genocidal, and Chara couldn't do anything. Chara's reactions to horrible situations have perfectly normal expanations such as laughing the pain away, and remember, Chara was very young for the incidents to happen. In conclusion, Chara was a normal child until the player came along. Not playing Undertale is truly the best ending after all.