The Spurs swingman is such a rapper, in fact, that on Wednesday he performed at the South by Southwest (SXSW) interactive conference and festival in Austin under the stage name Stak5. The performance was a benefit for teammate Matt Bonner’s charity, Sneakers and Speakers, and a handful of Spurs joined Jackson on stage. Social media was quickly buzzing with photos of the performance, where Jackson evidently backed up the rap skills that he has bragged about in the past.