Trick
Explanation
This comic is a Halloween-themed strip. A child in a costume goes trick-or-treating and encounters a figure at the door who announces: "I'm your grandmother's ghost from beyond the grave! Remember that post on your blog that I never said anything about? I'm here to make things right!"
The twist is that this "ghost grandmother" isn't offering candy -- she's come to settle old scores about something the grandchild posted online that she disagreed with but never addressed while alive. In the next panel, it's revealed this is actually a setup: the child says "Good haul. Next year maybe skip the Rabinowitz driveway" and another character replies "Remember to mention page 372, okay?"
The joke operates on multiple levels. First, it subverts the trick-or-treat format by having the "trick" be an elaborate guilt trip rather than a scare. Second, it satirizes the way older relatives silently stew over things their younger family members post online. Third, the final panel reveals this haunting is being orchestrated as a deliberate scheme, complete with notes about specific page references -- turning a supernatural guilt trip into a hilariously over-prepared neighborhood operation. The phrase "God bless the internet" at the end highlights how the internet has given everyone a platform to have opinions that their relatives might quietly resent.