I think your reason area is affected. e.g I tell my self I won't drink and drive, but after a pint of whiskey I'm fine to drive(or I think I am) Serious things don't change, but you might be a little more vocal when drunk. Or feel invincible.
Or spend more on something than normal, like buy a $100 bottle of wine when normally you would go for the $10 one, or go to the steak house when your budget suggests McDonalds. Stuff like that.