[grot]

What about the disutility from alienating everyone else in the coffee line?

Yet another example of how private incentives (to the cashier) trump public good...

[lionhearted]

> What about the disutility from alienating everyone else in the coffee line?

You can believe this or disbelieve this, but by far the most common reaction is along the lines of, "I wish I had the balls to do that..."