Heads up!

After flashbacks from the last Fall Showcase, the music class students lose hope as they struggle to find a gimmick to appease the crowd (and prevent them from throwing tomatoes). Later in the episode, they get too obsessed with the gimmick of being blue celebrities, that they forget to practice for the all-school showcase — all-school! As a result, their own audience of fans boos them, returning once again to throwing rotten tomatoes at the blue group.

Example of:
Produce Pelting