The curve of his mustache makes his face a perfect :C when he frowns.

"Now, look here, darlin'," he says, so not angrily at all, as he smushes his hat down on his head and stands with his fist on his hip, "I know a laugh when I hear one, and this, what you're doin' right now, is laughing, so don't even try to cover it up, 'cause I know you can't."