The duality of physics students! On the left, we have the happy-go-lucky freshman who thinks physics is just "velocity equals distance over time" and life is a carefree joyride. Meanwhile on the right, the hardened senior who's been traumatized by the full arsenal of kinematic equations, acceleration nightmares, and the existential dread of non-uniform motion. Nothing says "I've seen things" quite like the thousand-yard stare of someone who's had to solve for initial velocity using the quadratic formula at 3 AM. The transformation from "physics is fun!" to "physics is pain" happens faster than free-fall acceleration.