Embarrassment

[just mercedes]

    I've learned, after many years of screwing up, to never try to second-guess a test.
    Now-a-days I use a simple coin toss; this results in outcomes far better than the possession of knowledge ever did.

That's interesting. I read somewhere, sometime, about how seizing the moment is more important than the decision made. That people who made a snap decsion, under pressure, always had an advantage over those who vacillated. That even a wrong decision keeps things moving, and can later be corrected, but impetus lost due to prevarication can never be regained. 

That sort of fits with your toss of the coin.