[quote]R174: When I was a kid my mother told me the Wicked Witch of the West was made out of brown sugar and that's why she melted. I took it to be an acceptable explanation.
That's the result of an overly literal reading of the actual Frank Baum text.
"But the wicked creature was very cunning, and she finally thought of a trick that would give her what she wanted. She placed a bar of iron in the middle of the kitchen floor, and then by her magic arts made the iron invisible to human eyes. So that when Dorothy walked across the floor she stumbled over the bar, not being able to see it, and fell at full length. She was not much hurt, but in her fall one of the Silver Shoes came off; and before she could reach it, the Witch had snatched it away and put it on her own skinny foot.
The wicked woman was greatly pleased with the success of her trick, for as long as she had one of the shoes she owned half the power of their charm, and Dorothy could not use it against her, even had she known how to do so.
The little girl, seeing she had lost one of her pretty shoes, grew angry, and said to the Witch, “Give me back my shoe!”
“I will not,” retorted the Witch, “for it is now my shoe, and not yours.”
“You are a wicked creature!” cried Dorothy. “You have no right to take my shoe from me.”
“I shall keep it, just the same,” said the Witch, laughing at her, “and someday I shall get the other one from you, too.”
This made Dorothy so very angry that she picked up the bucket of water that stood near and dashed it over the Witch, wetting her from head to foot.
Instantly the wicked woman gave a loud cry of fear, and then, as Dorothy looked at her in wonder, the Witch began to shrink and fall away.
“See what you have done!” she screamed. “In a minute I shall melt away.”
“I’m very sorry, indeed,” said Dorothy, 𝐰𝐡𝐨 𝐰𝐚𝐬 𝐭𝐫𝐮𝐥𝐲 𝐟𝐫𝐢𝐠𝐡𝐭𝐞𝐧𝐞𝐝 𝐭𝐨 𝐬𝐞𝐞 𝐭𝐡𝐞 𝐖𝐢𝐭𝐜𝐡 𝐚𝐜𝐭𝐮𝐚𝐥𝐥𝐲 𝐦𝐞𝐥𝐭𝐢𝐧𝐠 𝐚𝐰𝐚𝐲 𝐥𝐢𝐤𝐞 𝐛𝐫𝐨𝐰𝐧 𝐬𝐮𝐠𝐚𝐫 𝐛𝐞𝐟𝐨𝐫𝐞 𝐡𝐞𝐫 𝐯𝐞𝐫𝐲 𝐞𝐲𝐞𝐬.
“Didn’t you know water would be the end of me?” asked the Witch, in a wailing, despairing voice.
“Of course not,” answered Dorothy. “How should I?”
“Well, in a few minutes I shall be all melted, and you will have the castle to yourself. I have been wicked in my day, but I never thought a little girl like you would ever be able to melt me and end my wicked deeds. Look out–here I go!”
With these words the Witch fell down in a brown, melted, shapeless mass and began to spread over the clean boards of the kitchen floor."
In 1974, Art Carney did a reading of 'The Wonderful Wizard of Oz' for Golden Records, and in it expressly stated, "the Witch was made of brown sugar."
So, you can see how the idea was floating around. Your grandma wasn't crazy.
[quote]—The Illustrated version looked like my grandma
You read the book?