As a person trained in hypnosis, I know that much of what you see in "My Husband is Not a Drunk" is pretty ridiculous. That being said, it is still a very funny episode and one you really should see.
The Petries are having a dinner party and one of the guests is a trained stage hypnotist. Not surprisingly, when the guests learn this, they want to be a part of his act, so he does a few demonstrations to entertain everyone. In one, he gives a post-hypnotic suggestion that when they hear a bell, they are rip-roaring drunk! Unfortunately, it doesn't work on Buddy...but Rob, who is in the other room, is VERY impressionable and soon begins acting like a drunk whenever a bell is rung.
Watching Dick Van Dyke act like a crazy drunk is fantastic. He's so limber and over the top that you can't help but smile as you watch.