England has one good tradition as I see it. They honor certain people who achieve greatly in their field with a knighthood (non hereditary). Many politicians, artists, actors, and scholars are rewarded above and beyond.
So the question is this; who among the ACTING community in the United States do you think deserves to be knighted (if we did that thing). This has to be based on their entire life's work and not one movie/TV show. They should have brought credit to their profession and the country.
On the other side some people ruin themselves so spectacularly that I will make them a Knave. They have caused damage to the industry, brought embarassment to the country, and are generally an asshole.
Finally, there is the Joker. A actor/actress who has embarassed just themselves and ruined their own career without hurting others.
A couple of obvious choices;
Sir John Wayne
Sir Gary Cooper
Dame Meryl Streep
Knave Charlie Sheen
Joker Lindsey Lohan