This is a very moist cake, however it doesn't seem to work for cupcakes (they're yummy, they just sink in the middle). I've had mixed experiences with trying different sizes/shapes of pans, but in a good old 9x13 it seems to be ok.
The reason this is a 'crazy' cake also makes it really fun to make with kids (read the directions!)
3 c flour
1/2 c cocoa
2 c sugar
2 tsp baking soda
3/4 c oil
2 Tbs vinegar
2 tsp vanilla
2 c water
Mix all dry ingredients together. Make 3 large holes in dry mixture. Pour oil in one, vinegar in the second, and vanilla in the third. Then pour the water over the whole mess and stir until blended.
Bake at 350 in a 9x13 pan for 30-45 minutes.