Multiple choice general knowledge What letter has the same effect as thunder? S makes our cream sour cream B makes our cream sour cream U makes our cream sour cream C makes our cream sour cream Reveal answer Fill a bubble to check yourself A Correct answer Explanation This riddle uses word transformation. When you add 'S' to 'our cream', you get 'sour cream'. The analogy is that thunder 'sours' milk in a dairy (a traditional belief), just as the letter 'S' sours 'our cream' to become 'sour cream'.