Post  Browsable Directories
"Index of" can be your friend and the same with "web mirroring". Unfortunately, and also to the point of the talk/series you have to go look at this crap. It's *usually* not important. stuff like the /icons/ in Apache.
But every now and then pure gold will show up. so you have to go look at it.
So some examples of browsable directories that were not /icons/ :-)