[jodacola]

Fun! Over a decade ago, my boss and I added a secret knock using Shave and a Haircut just like this to our wayfinder product, a large touchscreen app used on trade show floors.

It’s how we got into our admin to maintenance them at the shows and was useful if something was wrong with the onscreen keyboard (or we didn’t have our own keyboard to attach).

[mattbee]

I used it for a silly credits screen in football trivia game - summer 2002 I could knock on the screen of a many pub trivia machine to make it show my name :)