Swirling around the color conversation is the subject of rockers banning brown M&Ms. Now, we have some pretty hard evidence about Van Halen's brown M&Ms prejudices.
According to David Lee Roth, Halen's sometime frontman, so many music promoters did not read the rider in the VH contract (which according to Roth was as huge as a "Chinese phone book") that they added the unique clause so they could ascertain if the VH contract had been read thoroughly. In an interview, David Lee Roth said the outlandish request was to insure the music tour went safely, among other reasons. Read more about Van Halen's very specific requirements and the ABSOLUTELY NO BROWN M&Ms warning in this NPR article.