Unacceptable!
Apart from his other achievements Justin Roiland is also the voice of the Earl of Lemongrab from Adventure Time - which involves SCREAMING! every other line of dialogue at the top of his voice. Dungeon.
I have to ask - do voice actors have a technique for screaming that doesn't involve ripping all the skin out of their throats, or do they just rest themselves for days and then drink lots of milk?