The Brainiacs is a music band formed by Brainy, Gutsy, Clumsy, and Grouchy that was formed upon the Smurfs' return from New York City in the 2011 Smurfs movie, appearing mostly in snapshots during the end credits. He is seen been kicked off the stage by his fellow band members, but reacts as if the fans still adore him nonetheless, which is pretty unusual for his character.
Brainy gets booted off the stage...
...but the fans still seem to love him