Skyler Gisondo made a video to ask Hillary to accompany him to the prom. At the time, Gisondo was working on a movie, Night at the Museum: Secret of the Tomb. So he got his coworkers Ben Stiller and Robin Williams to help him out. The story behind the video is at The Hollywood Reporter.
"All morning, Robin was pitching more ideas," Gisondo tells The Hollywood Reporter. He was saying 'Can I say this? Would it be appropriate to say this?' You're Robin Williams. You can say whatever you want!"No confetti or dancing girls, but there is a monkey -and lots of star power. Hillary said yes, and a good time was had by all. (via Buzzfeed)