Purely optional, but chocolate cake always looks so...plain, so add some sprinkles if you like.
Step 2: Mix
Preheat the oven to 350 degrees F. In an 8X8 square pan/dish, mix together flour, sugar, cocoa, baking soda, and salt with a fork, making sure it is really blended together. Add the water, vanilla, oil, and vinegar, and again, mix together so that it's really blended together. Use a spatula to scrape down the sides if necessary.