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Explain xkcd: It's 'cause you're dumb.
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Evolutionarily speaking, mushrooms are technically a type of ghost.
Title text: Evolutionarily speaking, mushrooms are technically a type of ghost.


Ambox notice.png This explanation may be incomplete or incorrect: First draft—need transcript, links, and more detailed explanation.

Cueball is looking at a mushroom, and Megan tells him that genetically, mushrooms are closer to animals than to plants - both animals and fungi are part of the Opisthokont group, while plants are in Archaeplastida with the algae. Megan then walks away, and Cueball, after a while, stops looking at the mushroom and walks away too. When Cueball has his back turned, the mushroom growls, and Cueball turns his head back to look at the mushroom. The joke here is that while mushrooms may be genetically closer to animals than plants, they do not actually growl like some animals, so Cueball is startled to hear one growl. This could also refer to the hallucinogenic properties some mushrooms have.

The title text takes this further, by stating that mushrooms are technically a type of ghost.


Ambox notice.png This transcript is incomplete. Please help editing it! Thanks.

[Cueball is squatting in front of a mushroom.]

Cueball: Mushrooms are so weird.
Megan: You know, evolutionarily, they're closer to being animals than to plants.

[Megan starts walking away.]

Cueball: ...Really?
Megan: Yup!

[Cueball is still squatting.]

[Cueball stands up and starts walking away.]

Mushroom: Grrrr

[Cueball snaps his head around to look at the mushroom again.]

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