I have been eating nothing but McDonald's Happy Meals for 6 months straight. Yes, you read that correctly. Here's the math: Right now every McDonald's Happy Meal comes with a pack of McDonald's Pokemon cards. These are special promo cards you can only get inside a Happy Meal. A Happy Meal costs $5.99. The sealed McDonald's Pokemon card pack inside sells on eBay for $6.49. I buy the Happy Meal. I eat the food. I sell the cards. I make $0.50 and eat for free. I do this 15 times a day. I have not paid for food in 6 months. I make $7.50 a day for eating McDonald's. People can laugh but this is the greatest financial arbitrage on earth right now.