My classmates looked at me like I'm weird (but I am) while reciting this in the classroom. Because at that time there's no teacher and I'm very excited to do this task. It's quite difficult but quite easy as well? I don't know, lol. :D But I'm glad, now, it's so easy to recite the alphabet backwards, it really helps your daily living. Really. :)

This is where I learned it from. There are different songs available these days to teach you the Backwards Alphabet, but I have always liked this classic because the whole scene and song includes Alice's doubt that she could even learn to do it herself (make sure to start at 48:03 of this video):

http://youtu.be/LLIw8COJ0Qg?t=48m3s

When I was a child I learnt this in bed one very long Christmas Eve night trying to fall to sleep.