$50 cash is missing from my wallet. There are three possibilities: One: I spent it without knowing that I have. Two: I accidentally dropped it, which is impossible. Three: Someone stole it from my wallet. I’ve been wondering, if someone stole it, he stole the $50 cash and left the $20, $10, $5… in there for what? Having $50 and only $50 missing from your wallet is, shall we say, a miserable experience.