I don't think you'll find 0.2c relative velocities except near very energetic phenomena, especially not of things that are too small to easily see coming.

Cosmic rays are far too small to easily see coming, and we get those all the time here.

I think it should be clear from the context that this discussion was about macroscopic objects. Cosmic rays don't carry the kinetic energy equivalent of a medium size nuke.

True, the universe is generally a pretty unfriendly place that tries to kill you in any possible way.

To be fair, the universe was pretty friendly and created us in the first place.

Technically, we are the universe trying to understand itself.

Technically, we may be the universe trying not to kill itself.

Technically, we may be the universe trying to kill itself.