The eternal mathematical war between form and function! Top panel shows a teacher's horrified face when a student leaves a fraction with an irrational denominator (1/√2). Pure mathematical blasphemy! But that smile in the bottom panel when the student properly rationalizes it to (√2/2)? That's the face of a math teacher experiencing pure serotonin.
For the uninitiated: rationalizing denominators is that thing math teachers insist on like it's written in the Constitution. It's basically mathematical feng shui - same value, prettier packaging. Thirty years from now, you'll never use this skill, but you'll still wake up in cold sweats remembering that one time you left √3 in the denominator.