Robin Williams helped his Night At The Museum: Secret Of The Tomb co-star Skyler Gisondo score a prom date by starring in a video asking the teen's female friend to go to the dance with him.

In one of the late funnyman's final roles, Williams returned to his post as Teddy Roosevelt in the blockbuster franchise, and while filming the final installment, he spent his downtime helping 18-year-old Gisondo come up with ideas on how to ask a girl to the annual dance.

In an interview with The Hollywood Reporter, Gisondo recalls, "All morning, Robin was pitching more ideas. He was saying 'Can I say this? Would it be appropriate to say this?' You're Robin Williams. You can say whatever you want!

"It turned into this three minute, ridiculous thing. A prom-posal. I realised that was the most awesome three minutes of my life and I've accepted it will go downhill from there."

Gisondo, who plays Ben Stiller's son in the film, created a video featuring himself, Williams and Stiller, who attempted to convince the teen's pal Hilary to go to the prom with him, insisting he is a "good Jewish boy" and a "good kisser".

Crystal the Monkey, who is featured in Night at the Museum, also made an appearance by jumping on Gisondo's shoulder's and handing him a single red rose.

The young actor goes on to praise Williams for his selflessness and generosity during their time together, adding, "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."

Williams committed suicide at his home in California in August (14).