[Zigûr]

I think that "theory" (it's naught but people having a bit of fun, not a serious suggestion or something Professor Tolkien ever wrote) has been banging around the web for a while now.

Evidently if he'd had more time he would have said "Fly, you fools! Rush the ring to Mount Doom on an eagle you have no way of contacting so that you can be easily discovered by Sauron!"

I know it's just a joke but I still think it's spawned by people's poor appreciation and understanding of the book as well as of archaic uses of language.