tower
Explanation
The Joke
A king locks a princess in a tower "for all time," following the classic fairy tale setup. But the princess, rather than despairing, begins asking practical questions: "Is there food?" ("Bread and water"), "Is there a bathroom?" ("A hole in the floor"), "Does the tower have electricity?" ("I think so"), "Good phone reception?" ("Sure"). After getting satisfactory answers to all her needs, a dragon knight arrives years later to rescue her, declaring "Princess! I've come to take you away from this!" She responds with "Fuck off!" -- she has no interest in leaving.
The comic deconstructs the "princess locked in a tower" fairy tale trope by applying modern sensibilities. The princess treats her imprisonment as essentially a rent-free apartment with utilities. Once she confirms she has food, plumbing, electricity, and phone reception, she is perfectly content with her living situation.
The Humor
The humor comes from the clash between the medieval fairy tale framework and modern practical concerns. The princess is not a damsel in distress -- she is someone who has found a zero-cost living arrangement with all basic amenities. Her blunt rejection of her rescuer subverts the fairy tale expectation entirely. In an era of high housing costs and the appeal of solitude, the idea that being locked in a tower with free food and Wi-Fi is actually a pretty good deal resonates as a pointed commentary on modern life. The dragon-riding knight, who presumably went through enormous effort to reach her, being dismissed so curtly adds to the comedic payoff.
References
The comic parodies the classic fairy tale trope of the imprisoned princess, most famously associated with stories like Rapunzel and Sleeping Beauty, as well as countless video game plots (Super Mario, The Legend of Zelda) where rescuing a princess is the central quest.