What are some good oxymorons?

Oxymoron: a figure of speech by which a locution produces an incongruous, seemingly self-contradictory effect, as in “cruel kindness” or “to make haste slowly.”

List some of the best oxymorons (oxymora). Do you have a favorite? What is it and why do you like it so much?

Here is a massive list for reference. (Hit Ctrl and + to increase the text size.)

<em>Can you create your own?!</em>