David Harbour and Millie Bobby Brown fight like real life father and daughter on the set of 'Stranger Things'.
David Harbour
The pair will be on screen again when season three of the popular Netflix series hits screens this July, and the 'Hellboy' star - who plays Millie's character Eleven's adoptive dad Chief Jim Hopper on the sci-fi show - has opened up about his favourite memories on set with the 15-year-old English actress.
Speaking to Yahoo! Movies, he said: "She's just wacky ... we have an almost father-daughter relationship where like, she's so precocious, and I'm such a grumpy curmudgeon, that it's just us kind of arguing with each other."
The 44-year-old actor says he cares a great deal for Millie and is able to tell her when he thinks she's made a "bad decision", like a parent would.
He added: "I care about her a lot and I think she's making some good decisions and some bad decisions, and I'm very able to voice that to her and she's very able to argue back with me."
The 'Quantum of Solace' star - who previously dated actress Julia Stiles between 2011 and 2015, and was romantically linked to 'Fantastic Beasts: The Crimes of Grindelwald' star Alison Sudol last year - says that Millie bugs him with questions on his love life and admitted they "like playing up" to their "fake father-daughter relationship" in real life.
Asked for one particular highlight working with the young award-winner, he said: "It's being in the make-up trailer together, in the morning, and just sort of going over the things that are happening with our lives.
"And she's very interested in my romantic life too, which I'm annoyed by to no end ... it's really just that dynamic of like us as fake father and daughter, just like playing that up in real life."