** [[http://what-if.xkcd.com/21/ "Machine Gun Jetpack"]] gives us RecoilBoost.
** IcarusAllusion is the last image of [[http://what-if.xkcd.com/30/ "Interplanetary Cessna"]] (and the page quote is from the last paragraph of the same article).
** HardOnSoftScience is the first image and AltText of [[http://what-if.xkcd.com/111/ "All the Money"]].
* ReferencedBy: [[http://what-if.xkcd.com/98/ "I don't want to draw someone throwing up a gallon of blood, so here's a squirrel instead."]] [[https://youtu.be/xHePoR0mRTY This video]] about Jewish languages gives us "I don't want to talk about the Holocaust, so here's a squirrel instead."
* ScheduleSlip: There have been at least three extended periods (one from April to July 2015, one from September 2015 to January 2016, and one from April to December 2016 [[note]]Only three updates in this period [[/note]]) where Randall has not updated the blog with little explanation, although evidence suggests that the first two periods were connected to book releases (one of which was the What If compilation).
* ImageSource: Trope pages with images from this series include:
* WhatCouldHaveBeen: In the original ending of ''ComicBook/TheDarkPhoenixSaga'', the Shi'Ar left Jean without powers. Editor Jim Shooter did not like it, because that would be too soft for someone who had just killed an entire solar system; and the ending was rewritten to be Jean's death. The original ending was eventually published in "Phoenix: the untold story". One of the "What if" stories takes this original ending as a premise, and builds from there.