I used to think that the lyrics in Tim McGraw's song Only On Days That End In Y was actually "Only On Days With Indian Wine".
A childhood belief about misheard lyrics

others believed things like this
- I used to think the song Bette Davis Eyes was called 'she's got better days besides'.— JJ Simpson
- i used to believe that if you got barked at by a dog you would die in 45 days— woza
- I use to believe that peeing was bad for your body, and it should only be done once per 3 days— Master P
- I used to think the olden days came once every couple of yearsAnon
- I used to beleive that my dad only had a shave on Sundays. Because he got up before me on all the other days.— roy
- I thought that "tomorrow" was one of the days of the week— Frank