Bad or evil? All the coffee/tea makers are being cleaned at the same time. Sure, the number of people needing a hot drink might be lower before 8, but I’m willing to bet that the amount those few people need it is pretty high.

Michael’s coffee conjecture, aka the law of inverse coffee: the product of the number of people needing coffee and the amount they need it is constant in the interval between 4 in the morning and 11 in the noon.