I interned at Texas Instruments in Germany. Mostly engineers working there, mostly big expansive cars in the parking lot, so go figure our salary.. On each floor there was a coffee vending machine, a regular cup of coffee was 0,20€. On day, management sent an email to every employee "Free coffee during 1pm and 2pm". Guess what happened?

Everybody left their desks at 12:45 to stand in the queue, waiting for their coffee worth a few seconds of their time. At 2:15 everybody finished their coffee and went back to their chair.

I can't help but think management paid more in wasted salaries in these 1.5h than if they'd just made caffeine freely available all the time.