Explain xkcd: It's 'cause you're dumb.
- For a list of comics, see Comics featuring Barrel Boy.
Barrel Boy is a stick figure character in xkcd. He only appears in the, an early six-comic story whose parts were randomly published during the first several dozen strips. Barrel Boy is very different from what would quickly become the xkcd stick figure style, since he has a face and a human-like body.
That bottom image on the what if? article Niagara Straw features Beret Guy riding in a barrel, which may be a reference to Barrel Boy.