Justin Bieber has been erratic as of late, canceling gigs at The Late Show with Stephen Colbert and the Macy's Thanksgiving Day Parade as well as showing up at concerts where he is not expected. However, in a new off the wall stunt, Bieber was spotted at a college bar in L.A. and bought shots for University of Southern California (USC) students this past Friday night (November 27).

E! News reported that Bieber was in Orange County for the Thanksgiving holiday with friends and was first seen at Cook's Corner on Thursday, which is a well-known biker bar in Trabuco. "He was playing arcade games and having a cheeseburger and beers," a witness said to E!

On Friday, the Bieber appeared at 901 Bar and Grill, which is a haunt for University of Southern California students in Los Angeles. A source confirmed to E! that five to six people appeared and began an impromptu party with a few drinks. "Everyone got shots in their hand and they were all about to do a toast," the source said. "One of them got up on a stool we were like, 'Wow, that's Justin Bieber'."

An additional source reported that the "What Do You Mean?" singer had a great time with the students that night.

The stunt at the bar preceded a bizarre appearance at The Chainsmokers L.A. show, held at the Shrine Auditorium, where Bieber popped up onstage unexpectedly and began performing fan favorites "Where Are U Now?" and "Sorry" without warning.

Although Bieber wasn't scheduled to perform, the crowd was impressed and fan footage was uploaded to the Internet shortly thereafter. In a surprisingly gracious move, Bieber also made a point of telling the crowd what an "honor" it was to perform with The Chainsmokers as well as expressing thanks to them for letting him crash their show.

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