Scene: My office.
Employee: The flap wheel on the big pedestal grinder is no good.
Me: Ooh. Did it disintegrate on you?
Employee: No. There's no grit on it.
Me: No grit on it?
Employee: Just cloth. No Grit.
Me: Let's go look.
Scene: At the pedestal grinder.
Me: Okay, here's what I need you to do. Take the flap wheel off and bring it to me in my office.
Employee: Okay. Do we have a good one?
Me: Just bring it to me in my office.
Scene: Later, my office.
Me: You have the bad flap wheel?
Employee: Um, it was installed backwards.
Me: Ya THINK?!
- - - -
If you spin it the wrong way, all that hits the work is the BACK of the sandpaper! Stop Everything! The System Has Encountered An Unexpected Error!
I do this. Every. Single. Day.