Justin Bieber has been having an unusual week, and he topped it off by buying a round of drinks in a college bar in California.

Related: Justin Bieber Mysteriously Cancels “Late Show’ Appearance: “Sometimes Life Kicks Our Ass’

Following this week’s last-minute cancellation of high-profile performances on The Late Show with Stephen Colbert and the Macy’s Thanksgiving parade, Bieber made a surprise Friday-night appearance at a Chainsmokers gig in L.A., but first dropped by a nearby bar where he bought shots for everyone.

Related: Justin Bieber Makes Surprise Appearance At Chainsmokers Show

Thanks to a barfly who documented the incident and shared it on social media, we have a look at The Biebs stopping in at the 901 Bar and Grill, student bar at the University of Southern California.

//platform.twitter.com/widgets.js