"Audiences expect many different things from a horror movie. They expect be scared, obviously, but also probably to be a little grossed out, or to be so startled they jump out of their seat. One experience that's less guaranteed at a horror flick is to be laughing just as hard, if not harder than at a comedy movie. Yet, horror has proven itself a pretty natural pairing with comedy.
Both scares and jokes rely on subverting expectations, so it makes sense that writers adept at one would also be good at the other. These horror-comedies use the skills shared by both genres to create experiences that are both hilarious and scary at the same time, and can be the perfect choice for viewers who find some entries in the horror genre to be too off-putting or scary." -Ranker