In the Food Court episode where they had to work through the night, they get a little tired. In some people other than others. Chef David starts walking around with a big bowl on his head as a hat.
In another episode, Chef George is told that they have to incorporate Corned Beef into a second dish. In the midst of several other dishes, he starts saying "No way, no way corned beef, no way. Corned beef? No way, no way Corned beef."