So, we all know that ISTJs are awesome, that's an undeniable fact, but every now and again we do (regrettably) screw something up.
A little while back I was putting together a cabinet. When anyone brings home furniture of any type, it's on me to make sure it gets assembled, and I've put up tons of cabinets. This time though, after I finished nailing on the backboard, I stood it up and realized it was on backwards. It was quite the amusing fiasco after I got over the frustration.
Today my brother (not an ISTJ) screwed his door back on. Also backwards.
It happens from time to time, people mess up. What I want to know, is how you've messed up. So, tell me about something, funny or not, that you've flubbed. And don't worry, I'm not going to tell anyone.