Think back through the decades about some of the bonehead mistakes you've made. If you knew where you'd wind up ... would you have changed your mind? One of the problems with this exercise (if you're old like me) is you start forgetting the good, the bad and the ugly. Of course, depending how bad and ugly ... it could be a good thing.
Bonehead mistake #4: Writing this entry in my blog.
I AM SO DEPRESSED.