There's a difference between a show and concert. Any Joe Blow Band can go out and put on a concert, but it takes something different to put on a show. Slipknot definitely delivers when they take the stage. Check out the video of Slipknot DJ Sid Wilson taking a 15 ft. drop and crowd surfing nearly all the way around the venue, then the classic "(Zero BullS**t)".
Warning - video contains explicit language.