gravity falls season one: you know, just throw in some slight cartoon-y violence here and there. dipper gets a slight nose bleed in the season finale.
gravity falls season two: literally every taxidermy head will start to leak blood while chanting about ancient sins. a man is murdered off screen with an axe. well like kind of off screen. mostly off screen. sorta. almost every main character is then transformed into inanimate objects, some are still screaming while it happens.