Mine was when I was playing with a friend in Old Russia and we just sat down in a hill/mini-mountain and then sadly had to say good-bye.
But I felt the true potential that destiny has as a Virtual World, I want that to happen again.... And of course, this wouldn't be complete without saying " The whole time that I played in the Beta was my favorite part, specially the ones with friends..."
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The end of the open Beta. [spoiler]Hooray![/spoiler]