I'm a dev on XL at Microsoft and took a trip a few years back to meet some of our advanced users. I was blown away by their 'accidental' CS education through Excel. They built sheets (debuggers) to debug other sheets (programs) on their OS (excel), and did this not even using VBA.

In my own time, I've visited manufacturing plants where I've seen customers send the factory a spreadsheet containing nothing but a VBA project to exercise a (hardware) test jig for quality control.

This just reminded me that when I was young, I couldn't afford VB5/6, so I would program in VBA in the office products.