When your junior dev asks "What's the modulo operator?" and you're too deep into your fifth coffee to explain basic math.
Nothing says "I'm a professional" like hardcoding 50 if-statements to check if a number is even when return number % 2 == 0;
would do the trick. But hey, at least it's thoroughly tested for numbers 1-22!
The face in the corner is all of us reviewing this code during a PR. Silent horror.