Sooo was the famous Windows 98 BSOD a case of the Vorführeffekt or not? Plug'n'play functionality for the scanner did not work when demonstrated to the audience in that instance.
Yes, if what usually happens in private (and what you are hoping to demonstrate to another person or an audience) is different from what happens when you demonstrate it, you can [0] call it Vorführeffekt.
[0] since it's not an actual effect [0a], kinda like Murphy's law isn't a real law, you can call it that way, but you're not required to.
[0a] other than maybe nervousness of the presenter affecting things, but I don't think Windows is ever nervous about crashing.
