That innocent-looking Tower of Hanoi toy? To normal humans, it's just colorful rings for toddlers. But to programmers, it's a recursive algorithm nightmare that haunts our data structures courses.
When your CS professor first introduces this puzzle, they casually mention "oh, just move these disks following these simple rules" and then hit you with the mathematical proof that the minimum moves required is 2ⁿ-1. Suddenly you're having Vietnam-style flashbacks to implementing this in recursion while questioning your life choices.
The dog's thousand-yard stare perfectly captures that moment when you realize your elegant 10-line recursive solution is the same algorithm kids use to stack colorful rings. Pure existential crisis.