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xkcd #3114: Building a Fire
(imgs.xkcd.com)
Title text:
That was quicker than usual! The cabin's sprinkler system often makes it really hard to keep anything lit.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3114/
As per usual, Randall keeps going after the punchline was already delivered, ruining the comic. It would be better if there was no text in the final panel.
I feel like the last panel especially builds on the joke by continuing to divert expectations. It goes from humorously building too accurate of a log cabin, to coming back around to accidentally/on purpose starting a fire, thus completing the initial request.
The cabin is already on fire in panel 4. It is clear what happened. Then the words explain the joke.
It’s a typical instruction delivery speech structure:
Hence the text in panel 4 completes the pattern.