As much as I always loved "How the Grinch Stole Christmas" as a kid (and I still do!), the Whos used to make me mad. The narrator said that they dined on "rare Who roast beast," and since I had never heard "rare" used as a cooking term I always thought they were horrible people because they knew there weren't many beasts left, but ate them every year anyway.
A childhood belief about cartoons

others believed things like this
- I used to think that blue was a natural hair color but it as very rare, even rarer than ginger.Anon
- I used to think that Father Christmas stole toys from Smyths.— Shovel Tem
- I thought the tip jar at the restaurant was so people could give the chef cooking tips for how to cook better.Anon
- When I was really little i thought serial killers were people who stole your cereal.Anon
- I used to think the Grinch was going to pop out of my toilet when i was younger.— Jamal
- I thought that "heck" was a less horrible version of hell for people who were only KIND OF evil.— Oizys