While Blake Shelton had a few good zingers during the ACM Awards on Sunday night, Brad Paisley quietly mocking Zac Brown while the two jammed out on 'Whiskey's Gone' might have been the funniest moment. Paisley played an April Fool's joke on Brown, who seems to have taken the ribbing in stride. Although he does look like he's ready to rip that beanie from the singer's head, doesn't he?