That moment when your student solves a complex equation using some bizarre approach that violates every mathematical convention you've taught for 40 years... but somehow gets the right answer anyway.
Every math teacher has experienced that mixture of confusion, horror, and reluctant admiration. "Where did you even learn this?" "I made it up last night." 😱
It's like watching someone solve a Rubik's cube by disassembling it and putting it back together. Technically correct, spiritually disturbing.