One Pan Mud Cake

1-1/2 C flour
3 T cocoa
1 t baking soda
1 C sugar
1/2 t salt
Dump all these ingredients into an 8-inch square or 9-inch round pan, and mix them up. Pour in the following:
5 T cooking oil
1 T vinegar
1 t vanilla
1 C water
Mix it up until smooth and bake at 350 F for 1/2 hour.