Psst, I don't make coffee runs through the drive thru. And considering that on a rare day that everyone is there it's 4 people. and, quite frankly, I wouldn't be the one making that kinda run. That and my boss springs for good coffee anyway.
There's one at the Dunkin Donuts drive thru window. It's been there (at least) a couple of years. It makes me crazy that they would expect tips at a drive thru fast food, especially since that's not a position that is typically recognized as one receiving tips, so those folks are not among those making $3/hr (give or take).
While I do agree the scenario presented in the OP should never have happened, I think the scenario you are trying to paint really misses the mark. Unfortunately, I've been to Clark Funeral Home several times in the last month or so and (as always) found Mr. Clark to be very professional and caring.