So in my youth we made a cradle under the hood/firewall for a liquor bottle with a pour spout on top and connected the windshield wiper motor input hose to it and removed the hose from the hood and routed it down under the dashboard so when we wanted to add liquor to our drinks we just pushed the windshield wiper button. Haha, it actually worked...don't ask me why we did this, guess trying to hide the liquor.
We started playing with the windshield wiper when we aimed the sprayer to the side so when we drove by our friends we would squirt them. That also worked...