I know what you mean, but I couldn't think of a better example that would not have involved explaining something else that would have distracted from the point.

I know what you mean, but I couldn't think of a better example that would not have involved explaining something else that would have distracted from the point. I wasn't comfortable doing it, but at the same time, couldn't think of anything better. Actually, I have similar problems when teaching - I'm writing a git course at the moment, and it's hard to illustrate concepts in a realistic way without hopelessly artificial repos.