Ok, here's one then.

Gravity pulls planets into spheres, but if they're rotating, the inertia pulls them into oblate spheroids where their radius is bigger at the equator than the poles. Earth is about .3% wider at the equator than at the pole. For Saturn though, it's more like 10%. The real weird planets though...

...are hot Jupiters, which ALSO are shaped by the tidal forces from their stars (which they are VERY close to). In extreme cases they can take on a roughly "football" shape, where the radius towards the star > radius along the orbit > radius at the pole. WASP-121 likely has a radius more than 10% bigger towards the star than at the pole!

@dpthorngren 10% is kind of a lot. Maybe that's why Saturn always looks sightly odd in photos - well, apart from the whole ring thing it has going on. :)

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