Or perhaps it was the hundredth time one of our software engineers had innocently pushed out an img tag with an empty src attribute. Nobody joining the team could be expected to know that in early versions of IE, the browser would load the root path “/” for empty src attributes. The img tag would suddenly behave like an iframe, loading our homepage and all of its dependent resources in what could become an exponentially expanding recursive loop.
Amazing, the Trident engine really was something else. Also interesting, based on the web browser graph at the end, there were still people using IE6 in 2012, wild.