How space and time were nearly shattered on Saturday

It was a moment that no one had expected to happen, at least as suddenly as it did. But then, there was the rift in the space-time continuum! A tear in reality so epic that it threatened the very fabric of existence! A peril so great that it took fifteen Doctors, a Heterodyne, two wizards named Harry and a dog with a time machine to fix things! And along the way, all photographic and other evidence mysteriously vanished! Only one thing is left, to remind those in the center of it all of what took place...

(That, and a lot of very happy memories. Willow, I'm glad we were able to spend some time together, and I hope that we'll meet again someday!)