If anyone else starts using "What is it, fish?", I think there's a problem.
I had thought that Dorothy Parker was known for her "Dear Readers" usage in her columns of the 1920s in "The New Yorker." However, it was her reference to herself as "Constant Reader" that I was recalling.
And never was it more amusing than when Dorothy Parker, under her pen name, Constant Reader, reviewed A. A. Milne's The House at Pooh Corner in The New Yorker, with predictable, now-famous, results:
". . . And it is that word 'hummy,' my darlings, that marks the first place in The House at Pooh Corner at which Tonstant Weader fwowed up."