Alt text: They're up there with coral islands, lightning, and caterpillars turning into butterflies.
Only Pluto and Charon got us beat.
At least in terms of lower mass difference between the two bodies, and the distance the barycenter is moved from the center of the larger body.
[Edit: ... maybe Eris and Dysnomia come close too. ... and worth another mention that Jupiter tugs the barycenter further from Sol than Luna does from Earth. But all that's a different beast from visual size.]