Link

This is a video of sorts of different things in the Milky Way galaxy and their size in relation to the Earth.

Earth in True Perspective

This contains some of the same images, though not in video form. It also has images of distant galaxies that were captured by the Hubble Space Telescope.

"Oh, you can’t help that," said the Cat: "we’re all mad here. I’m mad. You’re mad."
"How do you know I’m mad?" said Alice.
"You must be," said the Cat, "or you wouldn’t have come here.”

- Lewis Carroll, Alice in Wonderland