* Your hair would get wet: Obviously!
* Dirt and oil would be removed: The shampoo and water would work to cleanse your hair.
* Your scalp would be stimulated: The massage from washing would improve circulation.
* Your hair might be softer and shinier: Depending on the shampoo and conditioner used.
* You would need to dry your hair afterward: To avoid catching a cold or damaging your hair.
Let me know if you had something else in mind!