I've 'Lernt' so much over my 56 yrs its hard to answer the question, .
at about 10 I taped a shotgun load to the end of my BB gun, and stuck it in a gopher hole and pulled the trigger. walking to the the house cryin with my eyes full of dirt, I fully understood backpressure.
... later in life I learned how to borrow money. that is the dumbest adult thing I did. I just about got that out of my system. It has been and interesting 56 yrs to say the least. this month marks 15 yrs for me around this site. thanks Josh and Liz and All. life is good.