Thanks to Devrant I've learned about rubber duck debugging. Never heard of it before! It reminds me of a story many moons ago when I worked for a certain multinational company as a business analyst. The company brought in some consultants who basically stole the work my team was already doing on a big project (a horrendous series of spreadsheets linked to data coming from the core systems) and sold it back to the company for an insane amount of money as their idea.

When they launched the new product, the team I was in was asked to test and review it. It took my colleague ten seconds to bring the whole thing to its knees and trigger a corrupt data export back into the core systems. Bearing in mind this external company somehow managed to charge tens of thousands of pounds. So what did my colleague do? Hack the system? Some kind of complicated sabotage? Nope. He typed "FISH" into one of the spreadsheet cells! Thus the FISH test was born.

That day I learned several things: it's easy to break things with a fish; the importance of validating your input; and the satisfaction of showing up the smug bastards who stole your ideas and work.