Rascal Flatts thought they were just putting on a show at the Grand Ole Opry.  But Tuesday night Vince Gill showed up to surprise the trio.  He said he was there to collect a $500 golf bet.  He was really on stage to invite Rascal Flatts to join the Opry.  They will be officially inducted October 8th during the Opry's 86th birthday bash weekend.  Ronnie Dunn will also make his solo debut on the Opry stage that weekend.  Check out the video of Gill throwing the boys for a loop.  At one point Gary Levox is left speechless.