You're super thirsty, and you see the drinks but no one there to serve yet, even though you're supposed to wait for the waiter, and ask to be paid. DRIVE AWAY WITH THE DRINK NO ONE WILL FIND OUT >:)
or
YOU CRY BECAUSE YOU'RE OVEREMOTIONAL AND THIRSTY AND YOU PROBABLY LEFT YOUR CASH AT HOME AND WON'T GET ANYTHING MAYBE