Comedy and horror have always made for a uniquely entertaining fusion. Both genres rely on similar storytelling structure -- a good scare operates similarly to a great punchline. Both rely on surprise for their ideal effect, catching the audience by surprise with a sudden but effective turn. When the two genres work in tandem, they can be some of the best examples of either genre, with films like M3GAN highlighting how entertaining the combination can be.
Source：https://www.cbr.com/shaun-of-the-dead-the-blackening-horror-comedy-best-mashups/
