The sad thing, half a decade later, is that hearing table tennis referred to as tennis would no longer surprise me:
On a lighter retronym note, I recently caught the "Simpsons" episode in which Kent Brockman refers to "sky stars" to distinguish the luminous celestial objects from the likes of "Matthew Modine and Charlene Tilton."
Hey, let's have a contest! If stars need to be called sky stars, what modifier do we need to insert before "custard" to make it clear we mean custard? And how about "the [blank] Olympics"?