I've spent an inordinate amount of time thinking about the biomechanics of rolled R's, and why many Americans struggle with that sound. It occured to me that maybe it'd be more helpful to think of it as a rolled L instead.

But I'm no linguist, so I figured that's probably nonsense. And lo, Episode 13 at 39:03, all on your own, you rolled your L and proved out my pet hypothesis! You magnificent kirin, you can roll your Rs! You know how to do it!