He did it again.

Kanye West made an unannounced appearance during South by Southwest Wednesday night at the Belmont in Austin.

At around 1:30 a.m. local time, West and rapper Big Sean joined 2 Chainz, a new signee to Def Jam, onstage, leading to dozens of flip cams springing up from the surprised audience.

The showcase also featured buzzworthy hip-hop/R&B acts like Machine Gun Kelly, Miguel and Elle Varner. Joe Budden, a member of the headlining rap group Slaughterhouse, apparently tipped fans off to West's impromptu appearance by posting on Twitter, "Just had a pretty deep talk w Kanye..... That was dope."

Watch the video here.