2 Chainz gave fans at a TRAP Karaoke event in Atlanta, Georgia a most memorable night out.

TRAP Karaoke is an event service that gives attendees a totally user-generated experience. As quoted on their site, "TRAP Karaoke is like going to church…but instead of 'Amazing Grace,' you’re singing 'Back That Azz Up.'" Their first of two sold-out dates went down this past weekend and ticket-buyers got their money's worth when 2 Chainz made a surprise guest appearance on-stage.

The Pretty Girls Like Trap Music emcee shocked the group of women who were in the process of getting down to one of his songs and then jumped on the mic to help them through the rest of the track. It's a moment those who witnessed it will surely never forget.

Watch a video clip from the show below.