"It tastes horrible," she said, still grimacing as her taste buds protested whatever she had just put into her mouth. The description - like a money that peed in battery acid - that popped in her head was one that Castle had used nearly a decade ago, horrified by the coffee that the precinct had on hand. "What in the hell did you order anyway?"
She hadn't paid attention, just passed over the money because she had bet him that the winner would purchase the drinks afterward.