Diageo (NYSE: DEO) must have stars in its eyes if it really thinks George Clooney’s tequila, Casamigos, is worth a third of what the company was willing to pay for the entire house of Cuervo. Although a case could be made that the approximately $1 billion purchase price for the high-end tequila brand will pay off, it’s more likely Diageo is going to wake up one morning with a very severe hangover and regrets about last night’s bar tab.