love horror films, and I agree, many of them make the best comedies. Personally I find any of the Exocrist films to be comedies, but that's just me.
one of my favorite so bad it's funny horror movie: Dead Dudes in the House
another classic: Children Shouldn't Play With Dead Things (Bob Clarke, director of this film, his first, went on to do the original Black Christmas, Porky's, and A Christmas Story)