I like the ideas here, so much so that I feel bad for giving you a disappointing answer: exam.

No own electronic devices in the exam room. That included everything, phones, watches, calculators and they also specifically mentioned “hearing aid” while giving out all instructions verbally.
Perhaps if there was someone it applied to they wouldn’t but…
And I had to log into our system to take it, which uses TOTP 2FA. An odd situation. Since the only other thing from clothes being allowed was a pen and paper with password (if needed), here we are.

But one real world example I heard from someone is no unapproved devices being brought into the server room.

Sorry, nothing interesting going on in here.