The only thing worse is when you drop something, tear the tool apart, can't find the gizmo only to see it two days later ten feet away.
I HS I rebuilt a VW engine, and before starting I put all my tools away and could not find the gland nut socket. Looked and looked and then I remembered. I set it on the crankshaft. Somehow missed it and bolted the pan on. Took the pan off and there it was> That would have hurt if I had installed it and started the motor!