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10+ 'Wedding Crashers' Behind-The-Scenes Secrets Fans Didn't Know

When's the last time you saw a film that could both warm your heart and crack your ribs simultaneously? For me, that film is Wedding Crashers.

This longtime favorite has just recently turned 15-years-old. So to celebrate, check out these 10+ Wedding Crashers behind-the-scenes secrets that fans didn't know!

It wasn't easy keeping Will Ferrell's cameo a secret.

Early cuts of the trailer actually had Ferrell in it, much to the chagrin of director David Dobkin. He had to have Ferrell edited out and made a goodwill pact with every reviewer that they wouldn't mention Ferrell's appearance.

Isla Fisher had some terrifying inspiration for Gloria.

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Isla needed to dig deep to get into the midset of a stage five clinger. So she turned to films like Fatal Attraction and The Hand That Rocks the Cradle for guidance.

Rachel McAdams first scene was incredibly intimidating.

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Rachel grew up idolizing Jane Seymour and Christopher Walken. Which made her first scene in Wedding Crashers all the more terrifying!

She got to learn about Walken's skills on the dancefloor first-hand.

The movie is actually based on the real-life experiences of producer, Andrew Panay.

When Andrew was a young man, he was visiting Las Vegas with a group of friends.

Completely by accident, they ended up at a stranger's wedding reception while they were on their way to the pool.

Casting the part of Claire proved to be incredibly difficult.

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Director David Dobkin knew he'd be working alongside Owen Wilson and Vince Vaughan, but at that time Rachel McAdams was still largely unknown.

Dobkin interviewed over 100 different actresses (including Academy Award winners) before finding Rachel.

To secure the part of Kathleen Cleary, Jane Seymour had to do something she hadn't done in over 30 years.

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Jane actually had to audition! Originally, the casting directors had their sights set on Raquel Welch.

According to Jane, it was the funniest script she'd ever read.

Owen Wilson ad-libbed one of his character's most memorable lines.

Remember Owen's classic "You know how people say we only use 10 percent of our brains? I think we only use 10 percent of our hearts," pick-up line?

That was all Owen.

Rachel McAdams listened to Fleetwood Mac to help her with emotional scenes.

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It's not a bad choice if you ask me. Is there a person alive who doesn't get wispy-eyed listening to "Landslide" or "Dreams"?

It gets me every time.

Director David Dobkin really used to wake the sun sitting on the steps of the Lincoln Memorial

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It's a scene he looks back on fondly; Dobkin did it all the time in his youth with his best friend. This adds such a deeper, more contextualized layer to the whole moment

I love it!

Owen Wilson actually uses one of the *Wedding Crashers* rules when he attends weddings.

"I think I try to follow the rule, rule 17 from this movie: blend in by sticking out," Wilson said to IGN. "You don't want to behave too much, but you want to be noticed."

If that's not advice to live by, then I don't know what is.

Fake Purple Hearts were available for purchase via the film's website.

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It didn't take long before these were quickly pulled down.

Apparently several U.S. Senators, as well as high-ranking members of law enforcement, didn't think the idea was funny at all.

The script needed a lot of work.

At first, Owen Wilson and Vince Vaughan were incredibly skeptical. They thought that the concept was funny but that the majority of the humor felt corny.

Together, they helped to re-write the script.

Vince Vaughan claims to have never crashed a wedding, but he does still have some pretty funny pick-up stories.

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Vince recalled a time when he and his friends used to feed pick-up lines to one another — the more ludicrous the better!

Can you imagine trying to break the ice with a line like "Excuse me for squinting, I've just been up all night painting miniature elves," I sure can't.

Vince Vaughan may or may not have the painting given to him by Todd.

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Some reports say that Vaughan took it with him after the movie wrapped. But according to a Reddit AMA that Vaughan gave in 2013, he claims to have no knowledge of where the painting is.

What do you think?

A sequel is in the works!

It's been more than 15 years since Wedding Crashers first hit theaters but finally, it looks like a sequel is on the horizon.

Both Will Ferrell and Rachel McAdams teased as much in a recent interview.