Explain xkcd: It's 'cause you're dumb.
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This is a pun on the homophones “canon” and “cannon”. A headcanon is a fan's thought imposed on a fictional world, often seen in fanfiction. Something that is canon exists in the author's actual world; for example, a romantic pairing that is in the text or script of the fiction. A headcanon, then, is a fan thinking "these two characters, who are not together in the text, should totally be together." These ideas are notoriously contagious ("It's really easy to get other people to believe in them."), and sometimes return to the author, who may decide to canonize them.
Randall's pun, adds an “n” and turns the imposed idea into a miniature cannon (a projectile weapon) attached to the head (which would be very easy to get people to believe in for other reasons).
The title text refers to the challenge of getting others to believe in, or accept, another's headcanon. Randall is implying that shooting a cannon at someone is enough evidence to believe in the cannon's existence.
- [Black Hat walks in.]
- Black Hat: New headcannon:
- [Cueball is sitting at his desk, using his computer.]
- Cueball: Yeah?
- [Black Hat lifts his hat, revealing his "headcannon": a tiny cannon on the top of his head. The headcannon fires and blows up Cueball's desk, the explosion throwing Cueball backwards.]
- Headcannon: BOOM
- Cueball: AUGH!
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