I'm sitting in the car with my mum, she's driving. It's drizzling, and a film of mist begins to develop on the windscreen. She turns on the air conditioner to get rid of that mist. A few minutes later, the mist begins to develop again.
Me: You should turn up the AC, that should fix it.
Mum: The mist is on the outside, not the inside.
Me: Yeah, right. Just turn up the AC, you'll see.
Then she flicks the wiper switch, and the mist gets cleaned up in one swipe of the wiper blades.
Now I'm silenced. Well play, mum!