Runaway

Runaway is a fearful word associated with the loss of a child or pet who runs away from home or losing control of a train as it barrels down the tracks.

The latter is less frightening than the former unless you're aboard the runaway train or it's headed right for you, at which point your heart starts to race and your life flashes before your eyes.

That is, unless you're a dumb cow ambling down the tracks without a care in the world, those beef-brained critters never seem to notice when a train is about to slam into their rump roast until it's too late...

(YouTube Link)

Runaway is a dark animated short directed by Cordell Barker, featuring music by Ben Charest (of Triplets of Belleville fame) and appropriately rendered in a hand drawn style reminiscent of Edward Gorey.