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Unforgettable Celebrity Encounters, Courtesy Of Reddit

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August 12, 2009 - Kevin Winter/Getty Images North America more pics like this »
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10. Robin Williams
One redditor who went to elementary school in New York City in the '90s remembered when they met Robin Williams while on their school bus. The Fisher King was being filmed outside Hunter College High School, and one day there was pretty significant traffic.

"[The bus] approached the school and several friends and I were watching out the windows as we got close. They were filming at the exterior of the castle right on the side of the street, which was causing the heavy traffic," they wrote. "As we got to the 'set' we basically stopped dead in front, and about 10 feet away Robin Williams turned and noticed all these gawking people on the bus and launched into a bunch of crowd work, talking to us as we leaned out the windows, cracking jokes, riffing on his homeless attire for the movie, etc."

"As a kid, this was a defining moment in my life. I was always impressed by his generous nature and self awareness. I’ll never forget that."