That was just the first of many.

Read on to find out what you never knew about “Stranger Things”' David Harbour.

Rumors of a romance with the hit “Smile” singer first surfaced in August 2019, whenE!

David Harbour smiles at event

Newsreported they were spotted together attending a London play.

Later that month, the two were photographed kissing at a Knicks game (viaMetro).

That April, he shared some photos viaInstagramof his birthday celebrations at Allen’s home in London.

David Harbour in Frankenstein’s Monster’s Monster, Frankenstein

The couple ultimately tied the knot a few months later.

Greenpeacerespondedwith a tweet, telling Harbour if he could muster 200,000 retweets, he could join an upcoming mission.

But, asVanity Fairreported, Harbour’s legions of fans ensured he received those retweets.

David Harbour and Lily Allen

During the trip, Harbour encountered whales, aggressive seals, and, as planned initially, penguins.

“I am not a bad*** explorer dude,” he told Vanity Fair.

Interviewed byWomen’s Health, Harbour revealed that he’s “terrified of the ocean.”

David Harbour in Antarctica

“I’m terrified of the unknown, which is a driving force for me.

I like this idea that the things that terrify us also draw us in.”

At his heaviest, Harbour fell in love with and married British pop star, Lily Allen.

David Harbour smiles at camera

As the outlet alsoreported, Harbour tore his Achilles tendon while playing Achilles, an injury steeped in irony.

“I’m so method,” Harbour joked onTwitterat the time.

According to Harbour, the injury was severe enough to require surgery.

Lily Allen and David Harbour

“It was like a dream.”

Harbour, however, has his own idea about the characters' backstories and how they may have interwoven.

“I think they dated in high school,” said Harbour in a different Los Angeles Timesinterview.

David Harbour on crutches

“And I think there’s some unfinished business.”

Yet there was one thing about “Stranger Things” that Harbour loathed: the title.

Initially, Harbour recalled, the series was called “Montauk.”

Winona Ryder and David Harbour at Stranger Things premiere

“And I was like, ‘That’s the worst title I’ve ever heard in my life.’

It sounds like some stupid guy going, ‘I’ve heard stranger things!’

It sounds like a terrible idea for a television show.

David Harbour in scene from Stranger Things

And so I hated it,” Harbour told Meyers.

As for Walken, Harbour found his portrayal of Iago to be wholly disturbing.

Walken, recalled Harbour, screamed at the squirrel, prompting the frightened animal to run off stage.

Christopher Walken smirks at camera

He opted to voluntarily check himself into a psychiatric hospital for treatment for his alcohol abuse.

While getting sober, doctors also diagnosed Harbour with bipolar disorder.

Harbour explained that he’d seen first-hand the benefits of therapy regarding his diagnosis.

Harbour in Law & Order

He added that it is essential for him to rely on psychoanalysis in addition to medication.

If you or anyone you know is struggling with addiction issues, help is available.

Visit theSubstance Abuse and Mental Health Services Administration websiteor contact SAMHSA’s National Helpline at 1-800-662-HELP (4357).

David Harbour at ComicCon

They are finished.'"

He also jokingly called dibs on the first slice of the wedding cake.

Several years later, the fan was asked whether Harbour made good on his promise.

Winona Ryder and David Harbour

Uniform and all," she tweeted, including aphotoof Harbour enjoying himself at the ceremony.

Like there’s no story, and it’s awful."

That, however, didn’t prevent him from accepting an offer to write a book.

David Harbour officiating wedding ceremony

The project, he explained, is a memoir that details his experience with mental illness and hospitalization.

David Harbour with long beard