"Brown M&M's"

From Wikipedia:

"The hard rock band Van Halen's now infamous contract rider called for, among other things, a bowl of M&M's backstage, but with provision that all the brown candies must be removed. In one rumored incident, someone had not removed the brown M&M's, and David Lee Roth trashed the dressing room. The M&M's provision was included in Van Halen's contracts not because the band disliked the candy, but because it served a practical purpose: if brown M&Ms were found backstage, then it was probable that other much more important technical aspects of the rider had also not been fulfilled properly."


So there you go.