What insider secrets can you tell us about some business or profession?

No, not about stocks or anything to do with money. Nothing improper, nothing illegal. Just…things that most people don’t know but that you do know first hand (and not from some magazine article or TV show) because you’ve worked in the business.

What behind-the-scenes tricks and tidbits can you share from the classroom, the restaurant business, the medical profession, hair styling and cosmetology, electricity and plumbing contracting, auto repair, or whatever field you’re experienced in—things that would surprise most customers or laypersons and perhaps educate the public?