"BUG-SMASHERS!"
https://www.youtube.com/watch?v=hMcLjNW8-SA&list=PLVct2QDhDr...
Watching Mark Abent demo bugs in his "handy dandy test level", all the "shenanigans" that result, and then show us the code and what the actual issues were, has been pretty much worth what I pledged right there :)