真心祝你们的婚礼变成葬礼
[zhēn xīn zhù nĭ men de hūn lĭ biàn chéng zàng lĭ]
This is a rather malicious expression indicating extreme dislike or curse towards the couple getting married. It sarcastically 'wishes' that their wedding turns into their funeral. It conveys negative emotions and is very confrontational.