Method acting, baby!
This clip from the Adult Swim Facebook page sees Roiland attempt to get in the groove by downing a load of tequila shots (along with some beers), before the whole session descends in to boozy, hilarious chaos.
Imagine being able to get wankered and make cartoons for a job! The lucky bastard!
He presumably sobered up eventually because season 3 is due to air later this year. Can't wait.