You could do a parody of dark/horror. Kill several birds with one stone. There are ways of doing it where it retains a high degree of darkness and horror, while still poking fun at the genre. Take a look at the Evil Dead/Army of Darkness movies.
Well, the first Evil Dead wasn't meant to be funny, but it was hilarious whenever Ash would get showered in blood/gore so many times, sometimes for the littlest thing.
