Software never works exactly the way we expect or intend it to, at least at first. Something inevitably goes wrong! What then? We are here for problem-solving, and every bug we encounter is a mystery, a wonderment, and a puzzle which upon resolution lets us move on to bigger, more interesting problems. Let's clear our heads and stop throwing spaghetti against the wall to see what sticks! We'll discuss how to systematically approach diagnosing the root causes of unexpected behavior in our code.