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> concert M&M check

For anyone that does not immediately recognize it refers to a popular trope that Van Halen contractually required venues to always sort M&Ms to not have brown ones. It is said this was their canary (in the coal mine) that was supposed to indicate if the venue took obligations seriously and hence will the concert be safe and up to standards.

This has a mixed review on snopes.com so take it with a grain of salt but it's a nice idea: https://www.snopes.com/fact-check/brown-out/