There's apparently a very expensive sundae which has "edible gold leaf", according to this page: A thousand-dollar ice cream sundae? Why not? — JSCMS
As well as another inedible-sounding ingredient, caviar.
If I recall correctly, I first heard about that sundae on a TV show starring Paris Hilton.
Buying and eating such an expensive sundae is something so remarkable I wouldn't be surprised if some folks somewhere blogged about the experience. I'm not in the mood to research this topic in depth, but if I was, I'd try a blog search