Monolith
Explanation
The Joke
The comic begins with a man saying he thinks women should form a single political monolith and take control of the government. A woman responds that women aren't all the same -- "how would you organize demands among such a demographically dispersed group?" The man clarifies: "Oh no, I don't mean a metaphorical monolith. I mean a metrological, 100-story tower made of women, rumbling toward the Capitol, making demands and getting them immediately." The woman asks "Where do you even go?" -- exasperated at the absurdity.
The final panel shows a news broadcast: "This morning the '55-kiloectory' laid waste to Capitol Hill. Senators were seen groveling and proclaiming mandatory chocolate croissants on Wednesdays." The joke is that the man's literal interpretation of "monolith" -- a massive physical tower of women -- actually worked, and the political demands being met are hilariously trivial (mandatory chocolate croissants on Wednesdays).
The Humor
The comic works on multiple levels. First, there's the wordplay between "monolith" as a political metaphor (a unified voting bloc) and a literal monolith (a giant stone-like structure). The man's proposal sounds like naive political commentary at first, but turns out to be a literal engineering project. Second, the punchline subverts expectations about what demands such an awesome display of power would produce -- instead of sweeping social reforms, it's chocolate croissants on a specific day. The absurd gap between the apocalyptic means and the modest ends is the core of the humor.
References
The concept of a "monolith" as a political metaphor is common in political commentary, where demographic groups are often criticized for not acting as a unified bloc. The visual of a giant structure approaching a government building may also evoke the monolith from Stanley Kubrick's "2001: A Space Odyssey" (1968).