Big Sean and Chance The Rapper are rumored to be working together on new music, but nobody expected Big Sean to jump on stage at Chance's charity show.

Chance hosts a monthly youth empowerment event in Chicago as part of his Social Works program. Monday, the event was an open mic show and the crowd got a huge surprise as Big Sean jumped on stage.

Sean Don performed some of his biggest hits, and I think everyone was waiting for an official announcement about a new collaboration between Chance and Sean. Despite no announcement, the crowd was still hyped, and Chance was quick to show love on Twitter.

Big Sean returned the positivity right after.

Check out a quick clip of Big Sean, Chance, and the entire crowd singing IDFWU.

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