What do you know by heart?

I still remember the Gettsyburg Address, the inscription on the Statue of Liberty, MLK's "I Have a Dream" speech, and lots of other "historical" information because I put it to music and as long as I can remember the tune, I can remember the words. I find that I know lots of songs by heart even though I haven't heard them in 25+ years... Again, its the music thing. The only book I know by heart is "I had trouble in getting to Solla Sollew" by Dr. Suess - did that for an Oral Interpretation Contest when I was in High School and took it all the way to third in the state. Rhymes are much like music.... I can also recite most of the movie Casablanca -- just because I've seen it like 11,000 times (grin). Esoterically, I know when someone loves and cares about me -- my heart feels it but that isn't usually what people mean when they use the phrase "know by heart".....