FarmVille loading ghostly cow sounds!?

Several users (myself included) have reported a strange sound while loading Farmville. This sound is somewhat a cross between a cow and a ghost. The users who've reported this, have a Tombstone on their farm, but are unsure if this is what is causing the sound. The sound is emitted while on the loading screen, even if the game sounds are muted.

Here is a sample I caught (finally!) while loading my farm: FarmVille Freak DarkFarmer's Ghostly Moo

Are any other Farmville Freaks experiencing this ghostly sound? Please share with us your experience.

This article originally appeared on FarmVille Freak.