I frequently go to a local donut shop on a Sunday morning to buy a dozen donuts. I don't pick and choose. I tell the owner that I want a variety. One day there was a different credit card reader that included a tip. I chose not to leave a tip. When I got home, there were only 11 donuts in the box. The next time I went there, I didn't leave a tip, and when the owner brought the box, it was sealed with tape. I took out my switchblade, cut the tape, and counted. "There's only 11 donuts here." Since that time, I order a dozen donuts, I get a dozen donuts, and I don't leave a tip.
Welcome to the new "Baker's Dozen," adjusted for inflation.