Conservation of mass Memes

Getting more than 100% yield in chemistry is like finding extra money in your bank account that you didn't deposit. Sure, it seems great until you realize something's terribly wrong. Either your product is contaminated with solvent/reagents, or you've accidentally created a quantum anomaly where matter generates itself. Pro tip: if your reaction defies the conservation of mass, you're not a genius—you're just bad at weighing things.