So risking that i might overexplain a joke, the original is about planes: The story goes that engineers looked at planes returning from battles to see where they should reinforce their armour. The returning planes had a lot of holes in the wings and very few in the body so they were like “seems like we need to reinforce the wings” but some bloke rightly mentioned that the planes with holes in the wings returned while the planes with holes in the body did not. So most holes being in the wings was survivorship bias and the actual parts in need for reinforcement were in places they did not detect holes from the returning planes because getting hit there seemed to mean the planes wouldn’t make it back.
For real. I have quite a bunch of colleagues that don’t know I’m not a cis Woman and i wear a fucking trans bracelet