Sex

He is bound to be fed up with all the stupid people he's heard on that show

Every day!

How can he still act surprised? (On a related note, this show is dumb as hell.)

Do you ever get so pissed that your background changes

I was watching one where Steve asked a guy "Name the last thing you had your finger in" and the guy said "My wife" and then turned and high-fived his wife, and Steve almost fell to the ground in shock and disbelief and I was just like "Come on, Steve, don't be surprised- you practically handed him that one."