SNA is a favorite, both because it's so different from the current airport name (sigh), and because I fly into it so often.
Originally shared by +Popular Mechanics:
What's with some of these nonsensical airport codes?
SFO, EWR, PDX? How the Airports Got their Codes
SUX to be Sioux City
How many of you followed the link to http://airportcod.es/# and looked for your initials?
Ha. Fun idea.
The full list (for US airports) is here: http://www.airport-data.com/usa-airports/faa-code/A.html
Sadly, no DCH. Though there is a DCH Regional Medical Center Heliport in Tuscaloosa.