kent
Explanation
The Joke
The comic plays on the classic Superman/Clark Kent secret identity trope. In the first panel, someone asks Superman, "How come I never see you and Clark Kent in the same room at the same time?" Superman replies that it is "probably just a funny coincidence." In the next panel, the questioner presses further: "It's just that Clark Kent has your same body, you know, but I like keeping my distance." This acknowledges the absurdity that Clark Kent's "disguise" is just a pair of glasses -- people in the Superman universe apparently notice the physical resemblance but choose not to investigate further.
The final panel delivers the punchline: Superman simply flies away shouting "Up up and awaaayyy!" rather than address the accusation. He literally flees the conversation rather than come up with a better excuse, treating his escape power as a way to dodge awkward social situations rather than fight crime.
The Humor
The joke works on two levels. First, it skewers the long-standing comic book plot hole of how nobody recognizes that Superman and Clark Kent are the same person despite looking nearly identical. Second, it turns Superman's iconic flight catchphrase into a comedic escape from an uncomfortable conversation -- the superhero equivalent of "I have to go, my planet needs me." The person left behind clearly is not fooled, making Superman's exit even more amusingly pathetic.