Though stress mostly has negative connotation, I have heard about a story in where stress removes another stress.
When fishes, alive ones, are delivered from the harbor to the inner city, they are usually place in a tank with another kind of fish that actually eat them!
If only those fishes are placed in a tank, they all die from the stress of being confined in a small place so long.
However, when a predator is presence, those fishes feel another form of stress, being unsafe, that they do not die from the stress of travel.
Unfortunately, I have so source about this story to say "this is a true story."