Train

The only way off a runaway train is to jump, but at that moment the ground looked to be going by so fast that I was paralyzed.

To quote Kilgore Trout:

The bus had a lavatory in the wayback rear, which no one ever made any attempt to use, and I remember consciously deciding to trust that the passengers had good reason for not using it instead of venturing in and discovering that reason for myself. Empiricism has its limits.