Help yourself to your flatmates food. If you are questioned about it, casually deny it and claim you didn’t even see his/her pizza in the fridge. Alternatively you could fly into a rage about how you are always blamed for stuff you haven’t done. Continue taking their food.
Pick up all the leftover drink at a party at the end of the night. Note: in order for this to work you should probably keep an eye on your own alcohol intake throughout the night to succeed.
Offer to run errands for your friends for cash. For example, offer to give them lifts or go to the supermarket for them for a small price. Ignore any selfish comments you may receive.
Avoid buying rounds on a night out. Claim you “forgot your wallet”. Or pretend you bought the first round. It isn’t advisable to do this on consecutive outings with the same people.
Avoid buying the latest fashions and trends, simply borrow your friends.
Borrow friends’ mobiles to make calls, or when visiting their homes make good use of their landline. Try to make it seem genuine.
Complain. Anytime you go for a meal or receive a service, complain that it was not adequate and it did not satisfy you as a customer. Most times you won’t have to pay for it. However, it is not recommended to return and repeat this process anywhere.