Singer Nathan Williams experienced a public breakdown as the band was unable to complete their set at the 2009 Barcelona Primavera Sound Festival. Williams, who admitted he had taken a cocktail of ecstasy and Valium, fought with drummer Ryan Ulsh and insulted the Spanish crowd, who then pelted him with bottles and a green shoe. Apologizing for their performance, Williams admitted the next day that he was addicted to alcohol. As a result, the band canceled the remainder of their European tour.
https://en.wikipedia.org/wiki/Wavves
I was wondering what color shoe that was. Now I know.