1) Stiff a waitress on the tip because she took a long time taking your order or bringing out the food. (A single person covering 20 tables is not their fault, so don't take it out on them).
2) Don't make a scene or scream at the cashier because you had to wait, standing 15 deep in line at the store because there is only one cashier. (Call up corporate and rant since it was their decision).
3) Berate somebody over the phone since you were on hold for a half hour.
None of this ever happens to me. Although to be fair, I do want to shake the people who hold the paper on our mortgage, but that's mainly because I swear I can hear banjos playing and pigs squealing in the background as they ask us to fax them a copy of a property tax bill that's already been mailed to them by the town, that they could look up on the town assessors website, and that we've previously faxed to them, but they somehow didn't manage to walk down from the fax shed to the tax department. Fax machine in the tax department? Yes, they have one, but only outgoing. Why? Because fuck us, that's why.