Freaked out a little bit today during my workout: I've been doing progressive overload on various dumbbell lifts for a couple months, and today one of my lifts was way harder than I expected. I hit failure ~ 4 reps earlier than Thursday. Only after failing even earlier on the second set did I realize that I had set the weight 20% too high. I felt dumb but also it's cool to get a little confirmation that I'm not just hitting "failure" via confirmation bias!