My dad is a CPC on the side; He's actually an accountant. One day I caught him programming Excel macros. His office has this spare computer which just runs macros all day long to automate downloading tens of millions of rows of database data from the company oracle database into thousands of Excel spreadsheet files.

He asked me if its possible to improve his system and I said I didn't know where to start.

I was quite surprised indeed, the things office workers can come up with ;).