Gyro part number
Admittedly, this actually happened to me. I was helping with some work on the Chinook crawling around in the nose compartment of the aircraft helping to look for a part number. I can’t exactly remember what magic black box we were looking at but I assume it was a gyro of some kind. I do remember being upside down with a tiny flashlight looking through a tiny mirror, desperately trying to locate a tiny number. Peeking around the corner I thought I finally had it. In my defense, the mirror reversed everything I was looking at and as we all know “objects in the mirror are closer than they appear”, LOL. For a second I thought “Ha! There it is!” yet the extreme shortness of the number quickly raised suspicion followed by the realization that all I was looking at was a label that said “TOP”.
I did find the actual number eventually but laughing at myself I thought that this is totally something Chuck would do.