December 23, 2014 02:30 PM

The world was forced to say goodbye to Robin Williams in August, but the comic star continues to live on through the positive and powerful memories he has left behind.

At the Dec. 11 New York City premiere of Night at the Museum: The Secret of the Tomb, the top-name cast took a moment to remember Williams, who reprised his role as Theodore Roosevelt in the film – one of his last completed projects.

Skyler Gisondo, 18, who plays Ben Stiller’s son in the third installment of the Museum franchise, has a very specific memory about how Williams, 63, changed his life – by helping Gisondo get the girl.

Busily filming during prom season, the young actor had to get creative when it came to asking his then-girlfriend to the big dance. That’s where Williams came in. With additional help from Ben Stiller, the three crafted a humorous video skit to send to Gisondo’s lady as a prom invitation.

The clip was a success, and Gisondo thanks Williams for it.

“It turned into this three-minute, ridiculous thing. A prom-posal,” Gisondo told the Hollywood Reporter. “I realized that was the most awesome three minutes of my life, and I’ve accepted it will go downhill from there.”

Adds Gisondo: “Robin was this bottomless reservoir of kindness and hilarity. It was just so special to work so closely with this guy whose movies I’ve grown up with and watch his preparedness and his kindness.”

Watch the full prom-posal above, and enjoy Williams’s undeniable cleverness and charm once more.

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