The Best Lesson I've Ever Taught

So I'm not real big on tooting my own horn, especially when it comes to teaching. Some teachers drive me nuts with their endless campaigning and attention seeking behavior. I don't do my job for the accolades, I do it because it's a job that needs doing, and I am one of the few people that can do it.  Most of the time I'd rate myself as a pretty good teacher. My strengths are behavioral management (keep unruly hoodlums under control) and assessment (giving lots of different types of assignments so kids are fairly graded). If I had to reapply for my job I'd be pretty confident about getting rehired, but teacher of the year? Nah. Too political and too intense. I'm not the kind of teacher that arranges field trips to the Story Telling Festival and has kids write and act out their own plays. But every once in a while all the pieces fall into place and I do a truly awesome job. Today was one of those days. Today may have been the best lesson I've ever taught.
Background: I'm staring a unit on Myth, Legend, and Folklore. Oral history is one of my great passions, and I think it shows when I teach this unit. Normally I have the kids do research projects on the origins of one of their favorite myths, legends, or folktales. I also have them interview their parents/grandparents to learn a traditional story from their culture. I have them read a novel based on myth, legend, or folklore like Harry Potter, The Lion, The Witch, and the Wardrobe, or Percy Jackson and the Lightning Thief, then extract the original stories out of the novel and analyze them.
The whole point of this unit is to familiarize students with new genres of literature, to help them gain an appreciation for oral history, and to expose them to multicultural literature that is not part of the standard cannon. 
Today, I took it to a whole new level. I collected about 30 picture books and/or short stories from all over the world. Like ALL over. I had stuff from Thailand, China, Vietnam, Brazil, Mexico, Navajo/Ojibwe/Creek Indians, Canada, UK, Tall Tales from the US, stories from Russia, Ukraine, Poland, Ghana, Puerto Rico, Zimbabwe, Aboriginal stuff from Australia, etc. I arranged the class into groups, roughly corresponding with a world map I drew on the board. I set out the books for each continent in the corresponding group of desks. Then I had the kids rotate around the room reading and analyzing literature from all over the world. The only rule was that you couldn't read 2 stories from the same continent (to increase diversity and discourage ethnocentrism).
It was amazing.
The kids were excited, enthralled, engrossed, engaged- even my worst students sat still, read, wrote, listened, and talked. The shy kids got involved. The cholos got involved. The fashionistas were involved. The jocks were involved. They were mixed up. They were reading. They were sharing. They were learning. They were appreciating world tradition and world literature. They began to understand the value of oral history and its place in culture and heritage.
It was arguably the best lesson I've ever taught.
It was epic.
I wish I would have videoed it for future reference.
The only problem is, how do I follow it up tomorrow?

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What's your favorite myth, legend, or folktale?
Mine's probably King Arthur.