You're currently driving your best friend's car, after hours of trying to let him let you drive it, you ended up getting it dirty right a few hours before an event you both had to attend. So now you have a pissed best friend and a dirty car while you're driving to the closest car wash at 9pm. As you get out you notice that the automatic one is off so you both have to wash it manually.

He gets even more irritated "Awesome... Just awesome, fucking moron I am to let you drive the car"

While you look at him start washing the car with the sponge, you take the water gun and splashes him with it all. He gasps

"You little..." he take the water gun to wash the car and start splashing it over you too