I was not expecting a passenger.

Keep this exact video unchanged: the same first-person ride, the same sled, the rider's legs and shoes in the foreground, the same track, trees, sky, lighting and every camera movement. Add only one new element: a small black bear cub on the track ahead.

0-1s: the bear cub is already standing on the track a few meters ahead of the camera, facing the camera, frozen in surprise.
1-3s: the cub spins around and scrambles away down the track ahead. One back paw slips and it flops onto its belly, then looks back over its shoulder straight at the camera.
3-6s: the cub pops back up and sprints down the track ahead, staying a few meters in front of the camera and glancing back twice.
6-8s: the cub hops off the side of the track into the tall grass.
8-10s: the cub bounds through the grass toward a large adult black bear waiting at the edge of the trees.

The cub is realistic: fluffy black fur, a tan muzzle, small round ears, clumsy baby movements, real weight and shadow on the ground. It stays the same size the whole time and stays on or beside the track. Mouth closed. Exactly one cub, and the adult bear only appears in the last two seconds. Nothing else in the video changes.