Everyone watching the 2012 MTV VMAs were pretty stunned when A$AP Rocky grabbed Rihanna's butt during their collaborative performance for the track "Cockiness", and Rihanna even looked as though she didn't expect him to do that.  A$AP sat down with Hot 97's Angie Martinez and explained what was going through his mind when his hand went down south on Rihanna's body, and also stated that his butt grabbing move was not practiced in rehearsal.