According to these pulp book covers, there is one thing that we know for sure: We should start investing in basement apartments now, to prepare for the future. Also, we need bikini tops. And tentacle polish.

Via Lots of Pulp.

As you can see above, it starts with harmless things like whip fights on flying discs. Sadly, the things coming out of the sky won't always be human.

Avian death from above is also a lucky break. After this, the tentacles start breaking out.

Be-tentacled small creatures.

Be-tentacled large creatures.

Be-tentacled robots.

And pure, unadulterated be-tentacled wtf.
Yeah, dudes. You better run.