Oh, celebrity feuds... In the world of entertainment, we all know they're bound to happen, and all we can do is sit on the sidelines with popcorn and watch them unfold. While some feuds, like Kanye West and Taylor Swift, go through their ups and downs, there's one beef that has gone on for years and doesn't seem to quit: Jimmy Kimmel and Matt Damon.

It all started back in 2005, when Jimmy claimed to have run out of time at the on his show, Jimmy Kimmel LIVE!, and had to bump A-lister, Matt Damon from the evening's lineup. Fans of both Hollywood stars hoped  Jimmy would bring Matt back on for  a future episode, but it quickly became clear that was not going to happen. Like Groundhog Day, each night at the end of his show, Jimmy fed the audience the same line: "Apologies to Matt Damon, we ran out of time." To say a pattern was developing, would be a serious understatement. The question began to arise... what's with Kimmel's constant Damon shade? And, there was one person who wanted answers more than anyone: Matt Damon, himself.

"APOLOGIES TO MATT DAMON..." (2005 - 2006)

Believe it or not, this feud has been building for over A DECADE, and based off this last weekend's Oscars fiasco, it doesn't look like it's going to be hashed out anytime soon.  From Jimmy kicking Matt out of his own movies and Matt f***ing Jimmy's then-girlfriend, Sarah Silvermanto attempting couples therapy (hey, at least they tried), these guys just can't seem to shake this. This feud has been going on so long we felt we could all use a refresher. So, we've put together a timeline of the key moments of the epic Kimmel vs. Damon feud: 

JIMMY BUMPS MATT FROM HIS OWN MOVIE (2007)

After Damon lost it on Jimmy during his "appearance" on the show, Jimmy fired back by attempting to kick Matt out his movie, The Bourne Ultimatum with the help of his sidekick, Guillermo.

F*@#ING MATT DAMON (2008)

Matt got his revenge a year just a year later, when Jimmy's then-girlfriend, Sarah Silverman, appeared on the show to break the news that she was actually f***ing Matt Damon. Oops.

JIMMY'S F***ING BEN AFFLECK (2009)

Sarah's news was a blow, but in 2009 Jimmy came back with a brilliant response, announcing that he was f***ing none other than Matt's best friend, Ben Affleck. Ouch!

HANDSOME MEN'S CLUB (2010)

Clearly, Jimmy had taken it too far in going after Ben, because in 2010 Matt hit Jimmy where it hurt by banishing the host from the Handsome Men's Club.

MATT TAKES OVER JIMMY KIMMEL LIVE (2013)

After the "Handsome Men" incident, Jimmy continued to bump Matt from his show each night. A few years later, Matt took matters into his own hands, kidnapping Kimmel and taking over the entire show.

MATT GETS ON THE SHOW! ...KIND OF (2014)

A kidnapping can really change a person's perspective, so following the incident, Kimmel finally made the decision to let Matt on the show. However, he set some boundaries and made sure that Matt's involvement stayed well within them.

COUPLES THERAPY (2015)

After nearly a decade of feuding, in 2015 Matt and Jimmy decided it was finally time to fix their fractured relationship. They took to couples therapy to smooth things over... it didn't work.

BEN AFFLECK SMUGGLES MATT ON THE SHOW (2016)

With so many mutual friends between them, it was bound to happen that one of them would try to intervene. Ben Affleck made a failed attempt this past Sunday when he tried to sneak Matt onto the show. The audience was thrilled, and with Matt literally on his knees, it looked like things may have finally come to a head... unfortunately (or fortunately, depending on how you look at it), Jimmy was not having it...

And, the feud continues. Though we're all about the love here, and reconciliation is always best... we can't help but love this feud. It's endlessly entertaining, it keeps getting bigger, and...

It's all in good fun.

***SPOILER ALERT*** Believe it or not, Jimmy and Matt are actually great friends. In fact, when Jimmy Kimmel LIVE! first began, the show wasn't doing great, and as a joke, Jimmy pretended that Matt was supposed to be on his show that evening and said the famous line "apologies to Matt Damon, we ran out of time."  13 years later, this fake feud has become one of the greatest - and long-running- on-air jokes, and these two can't get enough of it. Frankly, neither can we!

What has been your favorite Jimmy Kimmel and Matt Damon feud moment?