God was high when he created physics.

I love the fact that the day I notice this thread is the day I've been dropped from the physics program at my university (because of math courses, making the whole thing even better).

In any case, mine isn't so much a physical phenomenon as a principle. Anyone who's done Lagrangian mechanics is probably familiar with the principle of least action; essentially a particle will always, almost magically, follow a path where the total "action", a quantity which is surprisingly easy to calculate, will be minimized. I suppose that someone who hasn't done college physics won't find that too exciting, but there's a whole range of problems where the results of this can be applied, making them elegant and almost trivial when compared to the equivalent using Newtonian mechanics.

Jam it back in, in the dark.