You've all, at least once in your life, stood in front of a mirror and made faces for no apparent reason other than it looks funny.
Christine is not excluded from this. Unfortunately, she is unaware that just beyond the glass, a very dissatisfied man is now privy to her very unladylike behavior.
He'll get over it, I'm sure. Being ladylike all the time is immensely boring. Being a goofball, now that's what it's all about!