Roommate Survival 101 according to me:

here is some key advice if you have to live with roommates because housing in Singapore is more expensive than a G6 or adopting a baby {okay it's not, but it is pricey}:

• pretend you don't speak English. If they find out you do, always walk in the door with your cell phone to your ear regardless if there is a call. This will ensure minimal communication allowing you to conserve the energy you would have wasted on making friends for better things.
• make sure they see you drink straight from the carton of milk/juice at least once. You don't have to continue it, but if you do it just once, it's guaranteed they will never drink you stuff. 
• make sure they see you pick your nose just once right before sticking your hand into a bag of chips or candy. You don't have to continue it, but if you do it just once, it's guaranteed they will never sneak your treats
• make sure they see you eat off a dish then put it away dirty at least once. You don't have to continue it, but if you do it just once, it's guaranteed they will never use your dishes.
• never let them know you are smart or have common sense. If they ask you for a screwdriver, just giggle and say, "the drink? I don't have any alcohol silly" and shut your door. If they ask if you know the date, tell them the month. If they ask if you know any good places to eat, tell them the value menu at McDonalds is actually pretty good for the price. Do these things just once, and it will ensure that they never ask you for anything, ever!
• find out when they leave in the morning and return at night, and leave or return before or after those times. This will ensure you never have to be stuck in the elevator with them. 
• live with people smaller than you, and a different gender if possible. If that doesn't work, just once break the above rule and wear an ugly outfit as you leave and get stuck in the elevator with you so they think you have bad taste. This will ensure they will never borrow your clothes. 
• always lock the door when you get in, this way, when the roomies come home, you will have a 5 second head start as they fumble for they keys and unlock the door.

Well I think that should do it. Congratulations, if you accomplish this list then you are about 93% at peace while at home, and you are one of the lucky few who now how something in common with moi.