I've seen a bunch of these coffee spash pictures on here, and thought I'd add my own take.
Brought the camera out with the 50mm prime and took this outside by the grass, so we wouldn't make a big mess in the house. The splash was made with a rock -- a rock just small enough that it wouldn't break my favorite coffee cup, but big enough to make a dent in some coffee.
No strobes today. Natural light.