[wiskinator]

I met Bob when he interviewed me for a position on Square's embedded software team in 2013. One of my previous interviewers told me that I was being interviewed by the CTO and my anxiety spiked through the roof. Bob could obviously tell, and said "don't worry, I just like to interview all the folks using C in the interview". His problem was simple, and ruthless. Implement a circular buffer in static memory. Don't F it up.

It was the most fun I had that day, and I still use it as a gauge of how to interview folk (though I don't use that question).