I appreciate when instructor's attempt to relate their abstract course content to real-world situations. Math teachers who just come in and cover the board with numbers<&mdash>without any explanation of when one might need to deploy that equation<&mdash>do a disservice to math instruction. You have to teach Z-scores in the context of when you'd need to use Z-scores, or whatever.
But by the same token, you need to have some passing familiarity with your real-world example. "If a train leaves Pittsburgh at 4PM going 100mph..." was fine when most people travelled by train; now, not so relatable. And if you going to use, "If a plane leaves Pittsburgh" you'd better include, "not counting the time spent clearing security or the delay for the flight crew showing up" as part of the problem.