A ghost train from a snowy heist can follow you home to Los Santos — and cause a catastrophic head-on collision.

If you replay GTA V's Prologue mission too many times, the North Yankton train can fail to despawn and travel all the way to Los Santos, where it will eventually crash head-on into the normal Los Santos train, causing both to explode, derail, and massively distort — sometimes crashing your game entirely.

Source: Train Collision — CC BY-SA