Amish Friendship Bread is bread made from sourdough starter that is shared in the same fashion as a chain letter. Someone, who knows when, starts the dough and it gets fed and reproduces like crazy. At the end you use a bit of your dough to make bread or muffins and then pass on bags of starter to your friends.
My coworker Aimee passed some starter on to me a few weeks ago. I took care of it, fed it, bathed it, in sickness and in health. About ten days later I added a few more ingredients and made it into cinnamon raisin walnut muffins. Dallas and I ate a bunch of them over a weekend. The rest I brought to work on Monday, where they were a big hit!
I passed extra starter dough onto Anjum and Jess. Hope their bread/muffins turned out as good as mine!