The cartoon rabbit saying "NO2" perfectly captures nitric acid's (HNO3) aggressive personality in the lab. It oxidizes nearly everything it touches, producing nitrogen dioxide (NO2) gas in the process - hence the rejection. Every chemist knows that distinctive red-brown cloud means your gloves, lab coat, and dignity are about to be compromised. The meme is basically nitric acid's dating profile: "Enjoys long walks through metal cabinets and turning organic matter into yellow stains."
Nitric Acid As Soon As It Meets Something

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