I use to think that the song "there's gonna be a heartache tonight" was "There's gonna be a party tonight.
I have no idea why.
A childhood belief about misheard lyrics

others believed things like this
- When I heard "Don't Come Out Tonight(Bad Moon on the Rise), I thought they were saying Bathroom on the Right.— helen.sellers
- 'I've got candy in my ears tonight, baby'.
~Canned Heat, Jimiroquai.— Nin - I thought the song "Party Time" by Moby was actually saying "heart attack" (this was before I knew the title)— Elviessa
- I used to believe "Pedestrians" was a political party like Democrats or Republicans.— August
- I used to believe the living room furniture would party after we all went to sleep.— Ellen
- I used to believe my dolls would come to life at night and have a party while i was sleeping. — phil(: