Shame on you! 真丢脸!
What possessed you to do that? 你被什么迷了心窍, 竟做得出这种事? How reprehensible! 应该好好地骂一顿!
Your behavior was inexcusable. 你的劣行无可推诿. Don't you pull this stunt now. 你少来这一套.
Look at what you've done. 看你干了什么好事?