Well, when you've finished all the tasks and you're at the 5th floor. At the party interact with them. They won't really fight, but they would threat each other and stuff.
the eyebaker, he asks for a new type of oven of some sort, once u fire the fire guy, u promise to get him a new job, u give his resume to the eyebaker as his new “oven”, after u finish everything else and there’s nothing left to do, go back to the eyebaker and he will give you a cake for the 5th floor