all-2
Explanation
In this comic, a woman at a podium announces to the people of Earth that in three days, aliens will arrive to introduce humanity to the Galactic Federation. The crowd is nervous, unsure what to say or how to prepare. In the next panel, the aliens arrive and greet humanity warmly -- but then immediately announce that "the time has come to delete your browser histories, subscriptions, and subreddits that one else knows about."
The crowd reacts with dismay, one person asking "Why are they making everyone so upset?" and another responding "Heh. This happens on every contacted planet."
The humor works on the premise that joining a galactic civilization would require some kind of vetting or transparency process, and the most terrifying aspect of first contact is not war or enslavement, but the exposure of everyone's private, embarrassing internet browsing habits. The joke taps into the universal anxiety that people maintain secret online lives -- guilty-pleasure subreddits, questionable search histories, embarrassing subscriptions -- that they would be mortified to have revealed. The alien casually noting that this panic "happens on every contacted planet" implies that shameful internet behavior (or its equivalent) is a universal constant across all intelligent civilizations, which is both a comforting and deeply funny observation about sentient life.