Howard doesn't realise how far he is pushing Marion with his demands that she do everything for him. She feels like a slave and now that Richie and Joannie can pretty much take care of themselves, she is sick of being just a housewife and has certainly had enough of Howard's patriarchal attitude towards her.
Finally, furious she goes out and gets herself a job - as a waitress at Arnold's! To say that Howard is not pleased would be an understatement but Al isn't all that thrilled either when she keeps giving unsolicited advice to his customers about what they should and shouldn't be eating!
I like this episode and I like that Marion showed yet more grit and independence. Watch it, it will make you laugh and make you pretty proud of Mrs. C as well.