hustle. its impossible for one person to drink a gallon of milk. 100% impossible. so me and some friends (very big friends to back me up) go around to drunken parties and find the biggest guy there, call him a puss unless he can chug a gallon of milk, bet him 100$. he cant do it. usually pays abuot half cuz hes angry. do that 3 or 4 times in a night.