Write a scene where the character gets what they've always wanted, but not with the result (or perhaps in the way) they were expecting.
You may write it as general fiction. For example: a young woman longs to be married and her desire is fulfilled. However, the reality of everyday life makes her wish for the days when she had more freedom.
Or, you can take more of a fantasy, thriller, horror route. I think of Stephen King's Thinner.