It takes a real dedication to gratuitous extravagance to turn some ice cream and milk into something like THIS. A restaurant in New York City called Serendipity 3 just set the Guinness World Record for the Most Expensive Milkshake. And it costs $100.
So how did they make it that expensive? Basically they just imported the most expensive version of every standard milkshake ingredient, including:
Milk from cows in the Channel Islands, ice cream from Tahiti, a rare caramel sauce from Venezuela and Maraschino cherries from Italy. Oh, and edible gold on top.