First of all... What's a Black Comedy on films?, here are some definitions of this subgenre of Comedy that can help us to understand it better:

1. Closely related to Satire, Black Comedy takes bleak or taboo subjects and treats them with bitter amusement.

2. Black humor, also called black comedy, writing that juxtaposes morbid or ghastly elements with comical ones that underscore the senselessness or futility of life. Black humor often uses farce and low comedy to make clear that individuals are helpless victims of fate and character.

3. A black comedy or dark comedy is a film that takes a heavy, controversial, disturbing, or generally off-limits subject matter and treats it in a humorous manner.
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This list is made in chronological order, according to the internet, the first film of this subgenre was The Mechanical Butcher from 1895 made in France (If anyone knows of anything else that has been done before please don't hesitate to tell me).
As you will notice I encouraged myself to make this list because this is one of my favorite subgenres of films, because sometimes I get bored with bland comedies, as they can also be somewhat simplistic and boring.
Many of these films say what we would sometimes like to externalize but we don't dare and in other cases, they tell us what we don't want to hear or accept but after all there they are and no matter how much we want to, we can't ignore them at all.
Black Comedy could be a very versatile topic to approach on a film because this one fits with so many other genres like Drama, Science Fiction, Horror, Crime or some more.