David Foster Wallace gave a speech once and said “Two fish are swimming along. Another fish swims by and says ‘how’s the water!’ The two young fish say, ‘what the hell is water?’”
Love this — I often wonder this myself!
Hi.Yes.Hello.
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If you’re going to quote a literary legend like DFW.. Please quote him correctly.

There are these two young fish swimming along, and they happen to meet an older fish swimming the other way, who nods at them and says, “Morning, boys, how’s the water?” And the two young fish swim on for a bit, and then eventually one of them looks over at the other and goes, “What the hell is water?” -David Foster Wallace, This Is Water, Kenyon College Commencement Speech May 2005

http://bulletin.kenyon.edu/x4280.html