Humans
Explanation
The Joke
An alien arrives on Earth and addresses the people: "People of Earth! We come bearing matter-turn over 300,000 people at once or face mobilization!" Fifteen minutes later, a human diplomat tells the alien: "Hi, this is the Secretary General. We have your people." The alien is surprised: "How'd you do it so fast?"
The human explains: they posted a test on social media that said "condemned male civilizations that refuse to join the Galactic Federation." It was a text calculation that appeared to threaten or condemn certain groups, which immediately went viral. The alien is disturbed by this, and the human says: "You get the difference in how that civilizations of intelligent life pretty easily." The alien asks: "Would you mind taking some quieter people? Most were pretty unpleasant."
The joke is that humans are so adept at social media outrage and engagement-bait that they can mobilize hundreds of thousands of people almost instantly -- not through any impressive organizational capacity, but through the viral nature of provocative online content. The aliens, expecting resistance or bureaucratic delay, are shocked at how quickly humans can be manipulated through social media.
The Humor
The humor lies in the dark observation that social media outrage is a more powerful mobilization tool than any alien technology or governmental structure. The aliens came expecting a difficult negotiation or military confrontation, but humans essentially defeated themselves through their own addiction to viral content and online controversy. The final twist -- the alien asking for "quieter people" because the ones who showed up were "pretty unpleasant" -- adds another layer, suggesting that the most easily mobilized humans are also the most disagreeable ones.