5. The "It's All His Fault" Failure
The fiasco here comes in when—crappity crap—it turns out it's all your fault. Let's skip over the larger ethical point, which is that finger-pointing is beneath you. Finger-pointing is also dangerous. Thankfully, the one time you do it and it boomerangs back in your face inevitably wakes you up to the fact that you never, ever have to assign blame. You can ask the whole room, "What went wrong here?" The truth will come out—usually in a way that results in a solution to the problem.