Life with Louie pictures from show

We Want Our Jerk Back
"Can't you see what coffee's doing to you...? You're agreeable. Open-minded. Boring."
— Kurt, Multiplex

A common Sitcom plot where the total Jerk Ass learns his lesson, turns sweet and benevolent — and becomes absolutely intolerable, making the other characters yearn for the original personality. Eventually the character in question will revert to normal, and the reaction will either be relief, or realization that he really is worse in his obnoxious form.

A subset of Flowers for Algernon Syndrome. This becomes worse if the cast caused this change intentionally, because...