My 30 yr. old daughter and her fiancé came into town a couple of weeks ago. My wife and I decided it'd be fun to take them to a few local distilleries (he likes bourbon) while they were here.
After tasting a flight of different bourbons, and sharing an old-fashioned with me to boot, my wife, a little bit tipsy, decided that she'd like to purchase a bottle of one of the bourbons, so we left the "tasting" area, having already tipped our servers, and entered a small store they had on site.
My wife, after the sales clerk there rang up the total on the bottle of bourbon she was buying (one of those electronic pads where you insert your credit card), turned around and asked "how much should we tip?!!"
Sure enough, there was a prompt button for 18%, 20%, 22%, etc. tips!!! Had to look more closely for the "custom" option, which allowed me to put in 0%. I suppose that, typically dealing with folks in various stages of inebriation, that little feature sometimes works out well for them.
