Steve Carell has told how his creepy look for new film Foxcatcher was so effective that his castmates would distance themselves from him on set.
The American actor, best known for his comic roles in The 40-Year-Old Virgin, Anchorman and Despicable Me, donned prosthetics and heavy make-up to portray eccentric multi-millionaire and murderer John du Pont in the movie.
It tells the true-life story of du Pont, whose friendship with wrestling brothers Dave and Mark Schultz - played by Mark Ruffalo and Channing Tatum - ended in tragedy.
"The prosthetics influenced my performance more than I anticipated. Once all that make-up went on, people reacted and responded to me differently," said Carell ahead of the film's premiere at the BFI London Film Festival.
"He did have a very specific way of talking and a certain demeanour, and he has a specific look as well. I think just his demeanour was very off-putting.
"People naturally wanted to be separate from me. I was off-putting to them. So organically I stayed in character because I didn't really have any choice.
"Du Pont was not easy to shake off after filming.
"I still talk to Channing and Mark about the experience, because it was very immersive."
Carell studied du Pont's look, speech and demeanour.
The 52-year-old actor said: "He commissioned a documentary of himself and the raw footage was interesting. It showed a side that was not his public persona he wanted to project."
Playing du Pont is Carell's darkest role to date.
"I was not actively pursuing this movie or this role. It was not on my radar," he said.
"It was not a master plan that this dark role was something I would undertake."