Well, not at a museum, but at the library.
The university where I was both a grad student and a teaching assistant finally installed a computerized catalog system. While the library itself was fantastic and the library staff wonderful, the "how to use" instruction sheet for the new system was abysmal. And the system had been developed by the university computer department and was not at all user-friendly. There was no obvious place to put your cursor and start typing your keyword, or title or author, for example. And the instruction sheets were laid out in a series of square and rectangle blocks of text, with no clear "Here is how you start" heading anywhere.
After a hour of frustration the first time I tried to use the thing, I had to ask for help. The answers were blindingly simple, but not at all obvious to a new user.
So, when I was teaching Freshman English, I always spent one class a semester in the library, showing the students the various collections within the building and spending a fair amount of time explaining the electronic catalog.
Occasionally, we'd pick up a tag along or two while we were touring the library, but the moment I stopped by a terminal and started explaining the computer system, there'd be a huge crowd. People just wanted to learn how to use the darn thing. As long as my students could get close enough to hear me and see the screen, I didn't care how many people stopped to listen, although the first time it happened, it was very weird.