If I can get you to laugh with me, you like me better, which makes you more open to my ideas. And if I can persuade you to laugh at the particular point I make, by laughing at it you acknowledge its truth. ↗
There are some movies I can watch over and over, never get sick of. I'll put one of those on and be puttering around the house. Then a certain scene will come on and I'll just have to go over and watch. ↗