Ever show up to a Halloween party wearing the same costume as someone else? Well, things must have gotten awkward backstage before Blink-182's gig Sunday night. Mark Hoppus, Travis Barker, and Matt Skiba took the stage at KROQ's Halloween Costume Ball dressed as Joaquin Phoenix's version of the iconic villain. Blink just wrapped up its tour commemorating the 20th anniversary of their landmark 1999 album Enema Of The State. What's your Halloween costume this year? Will Joker be the most popular costume?