The Nome King is terribly afraid of eggs in the book as well, but unlike the movie, they don't kill him. The Scarecrow pelts him with eggs and they cause him no harm. The only thing damaged is his ego.
Don't eva let nobody tell you you ain't strong enough
I thought it was hilarious when the egg entered the Gnome king, and it turned out to be poison to him .. .LOL Very funny.. they finally tied in the Hen from Dorothy's farm home.. :)
It's never clear in the books how an egg would poison a Nome. The Nome King (who's more like an imp rather than a rock elemental) says eggs are poison, but he's hit with a couple and comes to no harm. Just "egg on his face."
A later book has this...
If by chance the inside of an egg touches one of these underground people, he withers up and blows away and that is the end of him—unless he manages quickly to speak a magical word which only a few of the nomes know. Therefore Ruggedo and his followers had very good cause to shudder at the mere mention of eggs.
The Nome King's successor is forced to release prisoners when Dorothy tells him she has eggs with her in another book. (You don't mess with Dorothy Gale. You. Do. Not.)
Some have said perhaps it is because eggs represent life while the Nomes live in cold, dead stone.
What we see and what we seem are but a dream. A dream within a dream.
I always thought the egg thing was funny, kind of like the David and Goliath thing. That part of the show is so cool when the Nome King is dying and all the other Nomes disappear saying "poison" and he's slowly being eaten away. Those scenes were incredible for a 1985 movie.
Indeed and in good spirit with the 1938 prequel where mere water was enough. But David uses a sharp stone after all, and so I just wondered if there was some "logic" to the egg. And there was some, as jad1986 explains above.
___________ ** I am normally not a praying man, but if you are up there, please save me Superman **