You: "Ten Mayfair please" Server: "Are you old enough to buy these?" You: "Yes, here is my ID" Server looks at your passport for at least five minutes. "Does this belong to your older sister?" You: "No, it belongs to me" Server: "But you look so young" You: "I know, it's bloody annoying. Here's my bank statement, a payslip, and my birth certificate which I always have on hand as further proof of identification"