I know i should plead the fifth and walk away, but to be fair, I simply use the fact that certain code, for example my DB abstraction layer is used in every one of my pages to assure myself that it works... well enough :-\
It's driving me nuts that I can't prove that my code is... well... perfect. I know that's obviously an impossibility, but certain code, such as the DB abstraction layer should be absolutely flawless.
Well, thanks for listening to me rant.