Phosphoric acid Memes

The PIN code is literally a chemical reaction. Lithium + phosphoric acid yields hydrogen gas + lithium phosphate. It's basically saying "I love you enough to give you my PIN, but only if you understand basic chemistry." Diabolical security measure. The spouse probably spent 20 minutes staring at this before realizing they married someone who uses chemical equations as passwords. Relationship goals for nerds who want their money to remain perfectly safe.