Those are all I can think of atm :) (besides adjectives like risky)
Skyhook, because it is too specific (not known unless you are a fan, unlike words like slam dunk and dribble) plus it has alternate meanings.
Also the sky mall, is that something from one specific airline? Unless you have flown with that airline you wouldnt know it, it isnt a fact you can "absorb" from reading books or watching tv.
(And you could make an argument for the montana one. I think the nicknames for florida, california and texas are pretty well known all over, the rest not really. But atleast it is an interesting fact, unlike the skymall thing)