Nicki Minaj -- Fans Pepper Sprayed at Concert

Nicki Minaj fans got an unwanted extra at her concert in Concord, CA Friday night when someone pepper sprayed the crowd, sending everyone into a panic.

Several fans were arguing for around 10 minutes about seating, which is weird because the concert was almost over. During Nicki's last song, a concertgoer took matters into their own hands, with the help of a canister. Check out the video ... it happens 17 seconds in.