I am not that well-versed in liquors, but since moving to Kentucky, I've learned about bourbon and have started taking it for granted. I expect a selection of bourbon behind the bar, and when I ask for bourbon on a plane, I don't expect the following:
Me: Do you have bourbon?
Flight Attendant: Is this bourbon? Shows me Jack Daniel's
Me: Um... no...
FA: I have bourbon, hang on. Goes to front of cabin, comes back and shows me Dewar's
Is this bourbon?
Me: No, that's Scotch
FA: Is this not bourbon? Shows me Jack Daniels again
Me: No, but it will do.
I have been that confused server ("What is 7&7?") -- and would probably still be confused if asked about brandy or Scotch. I just forget that outside of Kentucky, bourbon is not a given.