Sandra Bullock has surprised New Orleans high school students at their graduation - and told them: "Don't pick your nose!"
The Oscar-winning actress "adopted" Warren Easton Charter High School in Louisiana after it was heavily damaged by Hurricane Katrina in 2005, and has since donated hundreds of thousands of dollars to rebuild the school and pay for facilities and scholarships.
But the students of the Class of 2014 had no idea Sandra was at their graduation ceremony until she appeared on the stage. People magazine reported she emerged from her hiding place at University of New Orleans Lakefront Arena to thunderous applause.
The 49-year-old rom com star then delivered an amusing but moving speech with some important life messages.
Sandra told the students: "You know at Warren Easton, you are loved and appreciated and supported for what you have to offer. I was trying to remember my graduation and, oddly, I couldn't remember anything. I remembered how good I looked and then I went back and looked at pictures and I really didn't look so good.
"I didn't remember anything, because I was so worried about the future.
"Stop worrying so much. I don't remember any of the moments in my life where I worried. Raise the bar higher. Nothing is a failure it's just not supposed to work out.
"Eat something green every day. Do not pick your nose in public. How about we just go get a tissue? When someone who cares about you hugs you, hug them back. If someone doesn't want to play with you, it's OK. Not everybody is going to love us.
"And last but not least go find your joy. It's what you're going to remember in the end. It's not the worry, it's not the what-ifs. It's the joy that stays with you. And I want to thank you for the joy that Warren Easton brings me every day."
Easton is the oldest public high school in Louisiana, and Sandra has received a People's Choice Award for her work there.
The Gravity star has had a strong link to New Orleans since she adopted her four-year-old son, Louis, there and owns a home in the Garden District.