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I'm bored of my own voice, says Radcliffe

Harry Potter star Daniel Radcliffe has revealed how tired he gets of the sound of his own voice.

The former child star is promoting his new film, What If, in which he plays a medical student who forms a bond with a girl already in a relationship with another man.

The 25-year-old English actor (inset) has been plugging the rom-com since it premiered at the Toronto International Film Festival last autumn and says he starts to hate his own catchphrases.

Speaking in Los Angeles, he said: "When the film is as good as this I don't get bored talking about it but I get bored of my own voice.

"The most annoying sound in the world is me saying the words, 'you know'. It's my pause phrase that I say all the time and it gets boring."

Radcliffe stars opposite Zoe Kazan in What If, which features a scene where the pair swim naked in a murky lake.

Asked if he was worried about the effects of swimming in that kind of water, he joked: "We told loads of Canadians we went skinny-dipping in Lake Ontario, and they said they wouldn't do that.

"But we're here two years later. It's our children's children that will spout radioactive deformities as a result."

Radcliffe has embraced a variety of roles since hanging up his wand at the end of the Harry Potter franchise and said the differences are what keep him coming back.

"Having played one part for so long builds a desire to try as many things as you can," he said.