The Futility of Foam

Standing at Starbucks (*$ for the abbreviation-minded such as myself). Normally I get a grande skinny hazelnut latte extra hot. Today, switchin' it up a bit, I'll try the tall irish cream... "Here's your tall skinny irish cream latte, Marie!" And my drink about hits the ceiling because the cup weighs exactly 0.00438 ounces. I open the lid and it's half foam. This is why I never get a tall.