They do put the FUN in dysfunctional. I’ve been trying to unravel their relationship and get nowhere. I don’t think Sammy’s all that nuts (not that he isn’t other things), but he enables her, and feeds off her craziness. She’s just plain crazy. I think he’d be temperamental and touchy, but fairly normal with someone else. In the original episode, he was asking GR to make her listen, and seemed afraid of her. I almost felt sorry for him. In the second (when she was around) he was following her lead and there wasn’t any of that.
I loved when Amy was saying she wished she could clone herself and Sammy three times, then the former employee said the Amy clones would kill each other. 