You'd be surprised. Anyone who thinks they don't have a silly switch should take a pile of money and try their hand at trading. Your silly switch will trigger as soon as you lose money. You will proceed to make one bad decision after another until you have traded your account to zero. Each time you will smack your forehead in astonishment wondering how you could do such a silly thing.
One silly switch in particular I have is sometimes triggered in the face of control. I have a built-in need to be free of control. This need would conflict with that of another person who has a built-in need to be in control.