You're finally on your way to do whatever but something super annoying happens: the windshield fogs up and now you cannot see through. Even to such an amount you have to find a sponge or cloth to wipe a clear area on the window. Oops, look out! There's other traffic!
"Why does this happen to me?" you think, "it never happens when I am in the car with dad".
Without going into the details of the physics (water vapor in the air strikes down against a cold surface as condensation). First, you have turned on the car (0.), then here are some pointers to look for:
Always drive with clear windows!