There have been plenty of looney theories about Leo Tanguma's murals at Denver Airport (AKA "America's Most Inconvenient Airport".) My favorite ones are about the D.U.M.B. (Deep Underground Military Base) there.
I had to tear my 8-year-old daughter away from this one when we were at DIA a couple of weeks ago. I snapped some photos so she could study them at her leisure.