Captchas, those annoying “prove you’re not a robot” tests that many websites require to show you belong there, are something that have no analogue in the pre-digital age, or at least none that I can think of.
I don’t ever recall trying to enter, say, my gym back in the 90’s and having someone (likely someone with biceps the size of prize winning state fair hams) holding a manila folder say, ‘Ok, now, I’m going to show you 7 photos. Please tell me which ones contain a picture of a bridge. . . No, I’m sorry, that’s a dog with a Mohawk. Let’s try this again.”
Might have been fun, though.