A memory from about 15 years ago:
I thought the pizza place worker was joking.
"It's Friday. We don't make bread sticks on Friday," he said, after I'd ordered some bread sticks.
"Oh. Ha, ha," I replied.
"No, really, we don't," he responded. "We get a lot of orders on Friday, and bread sticks are hard to make."
I changed my order and then told my co-workers about the no-bread-sticks-on-Friday rule.
"I guess I'd better remember not to order salad on Wednesdays, then," one of them said. "After all, Wednesday is no-salad day."
I'd never heard of a pizza place not offering a side dish on a particular day. I wonder if they still have that rule. If so, I wonder if any of their would-be customers go to a speakeasy to get their bread sticks.