Have you ever noticed people who make really goofy facial expressions when they are dancing/performing/competing? They are obviously trying really hard, but it's funny when they can't control their expression. I don't know whether to feel sorry for them or try to help them. A good of them is the character for "Shall We Dance" (Japanese Version), who said something like, "I want to dance like Donnie Burns." A common face you see is the open mouth and the eyes squinted.