'10 Things I Hate About You' Cast Reunites for 20th Anniversary, Remembers Heath Ledger

"10 Things I Hate About You" was released 20 years ago this moth, but the film's cast and crew remember filming the '90s romcom like it was yesterday.

Cast members Joseph Gordon-Levitt (Cameron James), Andrew Keegan (Joey Donner), Larisa Oleynik (Bianca Stratford), Kyle Cease (Bogey Lowenstein), writers Karen McCullah and Kirsten "Kiwi" Smith and producers Andrew Lazar and Mark Irwin attended an anniversary screening of the teen movie at the Wisdome.LA Friday night.

The screening was followed by a performance from Kay Hanley and Michael Eisenstein of Letters to Cleo, who played the prom and over the credits in the original movie. A Q&A took place as well, moderated by Kory Davis, a.k.a. @MovieDude18, with proceeds going to Los Angeles autism charity OurTism.

In case it's been a minute since you've seen the 1999 movie -- and if it has, watch it now, it's still great -- the film put a modern spin on Shakespeare's "Taming of the Shrew." Long story short, Bianca (Olyenik) isn't allowed to date until her ill-tempered older sister, played by Julia Stiles) does, leading to a big 'ol scam involving Gordon-Levitt and Heath Ledger's characters.

At the event, the stars revealed on-set secrets, heartwarming anecdotes and of course spoke about the late Ledger, who tragically passed away from an accidental drug overdose in 2008. Keegan paid tribute to the actor by sharing a hilarious story of how he first met his co-star in the late 90s.

"We were in this hotel in Tacoma, Washington, I think we were coming back from rehearsals because he came late," Keegan began. "At that time there was no internet, I didn't really look, I think I probably had seen a headshot. I was getting on the elevator and right as the doors were closing, one of those classic moments, and the door just stops."

"This guy gets on and he's got a Didgeridoo," he continued. "I could just remember I was in character too and I was like, 'This f--king guy. Really? Long hair, Didgeridoo, Australian accent.' And that's the memory of meeting him."

Keegan then got serious and said, "He was absolutely such an epic part of this project...We love Heath."

Read on for more revelations from the event!

Gordon-Levitt explained how this project was different than any movie he has worked on to this day. According to the actor, it was all because of how the cast got along both on and off-screen.

"Genuinely, I don't remember rehearsing," Gordon-Levitt said. "But what I do remember is that we all spent basically every day and every night together and that's really rare. Normally when you shoot a movie you come together, and you work and then you go back home and we were all I think because of our age or because we were not in our hometown and because maybe in Tacoma there wasn't a lot for us, being underage, there wasn't a lot for us to do."

"We all just hung out so much," he continued. "I think we all just kind of fell in love with each other like we all just really loved hanging out genuinely and I think that's, if I had to guess, I think that's why the movie turned out so good and why people like it so much is because we really, really liked hanging out together and that kind of thing doesn't actually always happen.

"This is, of all the movies that I've done, probably the most outstanding example of that," he concluded. "Of a whole cast all like actually liking each other and hanging out with each other all the time. And that kind of thing shows through."

Caese may have played a small role, but it's unlikely anyone will ever forget Bogey Lowenstein and the line, "That must be Nigel with the brie!" As it turns out, "10 Things I Hate About You" was the actor's first audition -- he didn't even have a headshot!

"I didn't know what I was doing," Caese recalled. "I took a casting director class and was just weird in the class and then they called me later and said 'Hey, we just want to bring you, in we have this part for a total nerd.' And I was like,'Oh, thanks for thinking of me right off the bat.'"

Caese added that when he got to the audition, he was faced with "five hundred of the nerdiest people." Some, he said, were even wearing propeller hats and pocket protectors. "Someone's obviously going to beat me for this," Caese said. "And then I nailed it!"

"They were just like, 'Yeah we don't have to change your clothes or your hair,'" he continued. "They said, 'You look like shit. You won.'"

"10 Things" was initially going to shoot in Los Angeles, however, producers Andrew Lazar and Mark Irwin decided to film in Seattle after they found the perfect high school. The moderator pointed out that there isn't even "one set" in the film, as the entire project was shot in real locations.

"We were scouting locations in LA," Lazar recalled. "And we had heard that there was a school in Tacoma, Washington that was built as this beautiful, luxury hotel, it built in 1895. By 1898, it was bankrupt and then the school board bought it, so it's been functioning as a high school since 1898 and it literally looked like this beautiful castle from 'Taming of the Shrew' and it just fit like the whole Shakespearean time."

"So we really just asked Mark ... if we could go up and it would cost a little more money than it would shooting in LA," he added. In reply, Irwin laughed and added, "It actually cost a lot of money to go up there."

When the moderator went to ask Keegan a question, Olyenik pipped up to confess she had a thing for the teen heartthrob when she was a kid. "Can I say that I had the biggest crush on Andrew when I like 11," she said. Cease also chimed in to say he did too.

Olyenik wasn't lying about her crush, as she revealed she had posters in her room from his movie "Camp Nowhere." "I can't," she joked. "I still kind of can't." (Same, girl. Same.)

Keegan's reaction: "It's turning into a roast!"

Next up for @MovieDude18 is a reunion with the cast of "American Pie" next month -- keep an eye on his Instagram page for details. Proceeds will once again go to OurTism.

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