I researched it, and wrote my conclusion on my blog as a follow up to my original finding.
You can read it here
http://warnakeysbeachboysblog.blogspot.com/2007/05/something-big.htmlThe ironic thing about this grin.mp3 myth is the fact that it originated from a site titled "SuRFiN' AGAiN - The authorized International Jan & Dean website". In fact, I was able to get information about the song Snowflakes on Laughing Gravy's Whiskers from this very same site here.
http://www.surfinagain.com/archives4.htmTherefore, the owner of the site knew very well what that track was, where it came from and that it was not a smile track.
What a lying jerk!
Anyway, it seems like someone was just trying to throw some more wood into the figurative smile fire. Good tune though.