Benedict Cumberbatch has confessed he worries for some of his more "obsessive" fans.
Since his award-winning drama Sherlock became a cult hit, the War Horse star has accumulated a group of dedicated fans who call themselves Cumberb****es.
Benedict said: "There is some obsessive behaviour, which is quite worrying. I worry for them, not for me."
He added: "I'm still very sensitive and wary of people recognising me. The only thing that really annoys me is people trying to surreptitiously take a photo on their phone without asking.
"I feel it's cowardly and a bit pathetic. Just ask me if you really want me to have a photograph with you."
The 36-year-old actor is set to appear on the big screen in The Hobbit and JJ Abrams Star Trek 2, but will next appear in BBC TV period drama Parade's End, co-starring Rebecca Hall and adapted from Ford Madox Ford's original novels by Sir Tom Stoppard.
Benedict plays English aristocrat Christopher Tietjens and insisted on wearing a fat suit for the role.
He revealed: "I kept saying, 'He's a fat, blonde Yorkshireman. Why do you want me to play this part?'
"I insisted on the fat suit and plumpers, these things you put in your mouth, but I would have liked to have gone a lot further. I wasn't fat enough!"
:: Parade's End begins on BBC Two on Friday, August 24.