But just wait until season 2 debuts Sunday.
And a few episodes later, we find out what the young king might be like in the bedroom.
With his coronation, his malicious deeds amplify tenfold, Gleeson promises.

Credit: Image Credit: Mitchell Haaseth/NBC
There are scenes where I just do malicious things for no reason.
Gleeson was taking questions from EW between filmingThroneslast fall in Croatia.
I kind of rebel against her, Gleeson says.
Im changing up the design of the Throne Room and kind of throw my toys all over the floor.
I really liked that scene just because thats the first time the audience sees Joffrey for who he is.
Theyve always been nothing but lovely, he says.
I havent gotten anybody coming up to slap or yell at me.
For more on season 2, buy EWs cover story onThroneshere.
PREVIOUS:Q&As withPeter DinklageandEmilia Clarktalking season 2.