I was trying to see how deep I could go and put a sub forum in a subforum (so a subsub forum I guess?) and after the page refreshed... I can't find it in the admin panel :') So I can't delete the sub-sub forum or that subforum that it's in. The sub-sub forum still exists in the subforum though. 

Known issue, but you're not even supposed to be able to make sub-sub forums.

Gotchya, thanks :)