Keeping the money, that is for spending while out - not bills, in an envelope for the month. That way I know how much I have left to spend, and how much I am really spending a month. It helps to save a ton of money, and to keep track of your spending habits for the year!
A lot of people don't know that when they use their debit or credit card they lose track of spending, and it doesn't register as spending real money. A research study showed that spending cash registers as pain in the human brain, so you remember spending the money.