I used to think the Pledge of Allegiance contained the phrase "I pledge a Legion to the flag, and to the Republicans for which it stands." (need I add that my Dad was both an American Legion member and a staunch Republican?)
A childhood belief about the pledge

others believed things like this
- I used to believe that the "Pledge" of Allegiance had something to do with our "Pledge" cleaner. — Pledge
- I thought the Pledge of Allegiance was "to the United Steaks of America," and that we were saying it to cows.— bessy
- I used to believe it was illegal to not recite the pledge at school. Anon
- Through second grade I always concluded the pledge with '...indivisible, with liberty and just a straw.'— George
- I used to believe "Pedestrians" was a political party like Democrats or Republicans.— August
- I used to think Star Wars wis Democrat vs. Republican because they would talk about the Republic.Anon