Matthew Cobb (via Ed Yong and Robert Krulwich) sent me this fantastic footage of Pacific white-sided dolphins (Lagenorhynchus obliquidens) off the coast of California. The action begins about two minutes in. I won't say more.
To make it large, and you should, click on the word "Vimeo" on the lower right of the video.
The Vimeo caption is this: