When me and my friend were in kindergarten, we used to sing this rhyme "hey who's that it's a missippi cat M-I-S-S-I-S-S-I-P-P-I". Only we heard it as "M-I-S-S-I-S-S-S-P-P-I". Well, we got into a whole fight about it with our dads, until around three months ago- I'm fourteen now- that our dads were right. I still won't admit it, though...
A childhood belief about misheard lyrics

others believed things like this
- I usied to believe that there were lobsters under my dads couch!!— Jessie
- When i was a kid, i used to think that my dads moustache grew out of his nostrils — l.j.
- that the smallw arts on my dads neck were caused by swearing!— steve
- Until I was well along in years I always thought our family was Irish because my dads birthday was March 17th— Gladys
- I used the scar on my dads leg was a shark bite when in fact he fell off his bike when he was a child— Wendy Murray
- my sister told me that bunkers on golf courses were for children to play in while their dads played golf.— Julie