Surprising explanation for a semi-famous story.
By the early 1980s, Van Halen had become one of the biggest rock bands in history. Their touring contract carried a 53-page rider that laid out technical and security specs as well as food and beverage requirements. The "Munchies" section demanded potato chips, nuts, pretzels and "M&M's (WARNING: ABSOLUTELY NO BROWN ONES)."
When the M&M clause found its way into the press, it seemed like a typical case of rock-star excess, of the band "being abusive of others simply because we could," Mr. Roth said. But, he explained, "the reality is quite different."
Van Halen's live show boasted a colossal stage, booming audio and spectacular lighting. All this required a great deal of structural support, electrical power and the like. Thus the 53-page rider, which gave point-by-point instructions to ensure that no one got killed by a collapsing stage or a short-circuiting light tower. But how could Van Halen be sure that the local promoter in each city had read the whole thing and done everything properly?
Cue the brown M&M's. As Roth tells it, he would immediately go backstage to check out the bowl of M&M's. If he saw brown ones, he knew the promoter hadn't read the rider carefully—and that "we had to do a serious line check" to make sure that the more important details hadn't been botched either.