What episodes would have been rated 18+ had they ever aired outside of America?

[JHC1990]

We obviously know that the series never aired outside of the US, but had it ever have been, what episodes would have gotten an "Adults Only" rating in which countries?

[Aaendi]

I don't think any episode would.  I mean it's a show to teach children how to cope with the challenges they face in the world.