The character of Morty is made out to be a habitual drunk. There's a scene where he is unable to perform his job (involving driving) because he has drunk so much that the bartender refuses to serve him more.
Bridget is kidnapped to become the Leprechaun's bride, and he talks about how he will have sex with her and how her body will be transformed to carry his children. Whilst nothing extreme happens on-screen, viewers may find his threats disturbing.