Cup Half Empty Or Half Full

Despite my attempts to be a positive person, sometimes I have a hard time seeing the glass half full. In this case however I believe I am fully justified in seeing the paper cup as half empty. I had a hard time deciding if I should go with regular or large frozen yogurt last night. Glad I chose large. They weighed the serving and everything so I know I must have got that I paid for, but that large cup isn't even half full. No wonder people here are so thin.