Here's a meme to start: Things you used to think that were more than a bit wrong- and you don't mind being laughed at for it now.
I used to think that POW-MIA was a Native American reservation.
"One nation, under God, invisible..."
Rasins had nothing to do with grapes.
Ice milk: Milk and ice cubes.
Those are all the good ones I remember for now, but I might edit this post later.
I thought the same thing too until I was about 12 or 13 (being 16 now).
By the way, I found your LJ off a post you made in Tysha's forum. Just thought I'd stop by ^_^