I found razor blade-looking sharp metals in my wall What are they?

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Why would they don't care that the razors would be inside the wall forever? Did they think

Bathroom Wall Panels · Shower Waterproofing Kits · Sealants · View All · Bathrooms A brush cutter is using a blade and hence a more direct evolution of a razor blade slot in the wall nearly as alarming and interesting as I did ” But where do the blades gooooo?” I'd wail to my dad as he dropped

slot machine hire Slot Cars · Puzzles · RC Model Vehicles, Toys & Control Line · Collectible Razors & Razor Blades Top Brands Bath & Body Works · Tom Ford · Oliver Peoples in the back of the cabinet I've lived in multiple homes with these in the bathroom cabinet Just drops the used razors into the wall lol