Let me warn you, this video is touching.  It's possible you'll need to have a tissue handy.  Don't say I didn't warn you.

Jessica, graduating from California Polytechnic State University, had no idea her brother - A US Marine stationed in Afghanistan - would be home for her graduation.

Hit the break to see the video, and read her parents' comments. 

"Our son, recently home from Afghanistan, surprises his sister during the graduation ceremony at California Polytechnic State University, San Luis Obispo. She was extremely disappointed when we told her he would not be back until the end of the month. Guess we lied a little. Ok, a lot. A special thanks to all at Cal Poly who made this possible. Enjoy."