There's few episodes I don't enjoy The one that always gets the most laughs out of me is where Fry gets sent to the robot insane asylum. Roberto is a laugh riot in that. My favourite line is when he returns to rob the same bank "Give me what's left of the money...and that pen, try and tear it so most of the beads are on my end"
The episode is Insane in the Mainframe from season three. Favorite Roberto moment: "You did good back there, Bender" "Aww, it was nothing." "It was NOT NOTHIN'!!...I want to make it up to you." *walks into the same bank*