Number one, we've just begun
Rod Dreher revealed recently that he couldn't come up with more than six of the Ten Commandments from memory. He also pointed out the irony of this fact coming from someone who often gets on his "high horse about theological ignorance," so I won't pile on.
I've mentioned before that, while I haven't retained everything I learned at my evangelical grade school, I do recall a catchy song for remembering the U.S. presidents in order. We also performed a lot of musicals, including the popular '80s Christmas program Angels Aware.