That is unless you open the door to find Mamma Mia! star Dominic Cooper standing there.
It turns out the actor was asked to doorstep people in preparation for his role as shady mortgage salesman Dave in a new BBC Two drama called Freefall.
"I was never sure whether the director had told these people I was an actor or whether I was an actual mortgage broker," says Dominic, 31.
"It felt very heartless a lot of the time. It was actually quite terrifyingly easy to get them to agree to these mortgage terms that they wouldn't be able to afford."
A sobering drama written and directed by the multiple Bafta-winning Dominic Savage, Freefall tackles the current financial crisis by following the lives of three men with everything on the line.
There's Gus (played by Aidan Gillen), a high-flying city exec who packages and sells bundles of mortgages for extortionate profit. Dave, the mortgage broker who can make anything happen. Then Dave's old school friend, Jim (played by Joseph Mawle), who's offered a way out of the council flat he and his family live in through an offer that seems too good to refuse.
Dominic thanks his own old school pals who are now salesmen - "although not as brutal as Dave" he's keen to point out - for sharing the tricks of the trade with him.
"It's very conceived. You go into someone's house and get a very quick understanding of who that person is," he reveals.
"You see little things in their house, things that they're really obsessed with or that they really want and you cling to them and use them as tacks to inspire this person to buy your product. It's really clever."
Asked if he has retained any of these new-found skills, he replies with a mischievous grin: "No, I've forgotten them all."
Dressed in jeans, a black shirt and leather jacket, Dominic's got the dressed-down movie star look down to a tee. And while he may be well-spoken and articulate, you sense a side of roguishness to his "butter wouldn't melt" persona, which had to make him the perfect casting choice for Dave.
Dominic admits he revelled in the chance to play the smooth-talking salesman.
"Yeah, I was excited to get under his skin and understand how these people operate," he says.
"Dave's horrible, he's an awful guy. He's totally full of himself, he loves the money, and he just wants more of everything.
"But I don't blame him. I don't look at the people that did what he did and think, 'How could you have done that?' because we all do what we do for a reason. Dave just didn't question the consequences.
"It's totally about greed, but then that seems to be the world that we're living in at the moment. We seem to all think that we're owed something."
In an example of life imitating art, Freefall was written before the major banks crashed and burned. Sensing we were coming to the end of something in a potentially cataclysmic way, Savage felt a requiem for an era was required and it needed to be done quickly.
"It was a small crew and there's none of this, 'quiet please, action' when you're working with Dominic Savage," says Dominic. "You're shooting all the time."
The result is a raw and authentic drama accentuated by a script that was completely improvised.
"The director kept telling us a script would arrive and it never materialised," says Dominic, laughing.
"There was a trepidation of not knowing what to expect, which was very intense and frightening but it made you feel like you were having to pluck thoughts and make snap decisions, so I found it exhilarating and liberating as an actor. It was challenging and rewarding..."
Sensing his gushing tone he stops himself and says: "Oh dear, I sound like I'm trying to get another job!
"But we were told there were going to be times when it feels terrible and that we'd just have to embrace that and absolutely go for it as long as were clear about what the character was thinking and what we needed to achieve in the scene. We just had to take a risk."
Making her acting debut as Dave's beautician girlfriend is Girls Aloud singer Sarah Harding.
"She was great," says Dominic. "We thought she sounded perfect for the role, so we got together and did some improvisation. She took to it immediately and just did it."
Dominic's previous on-screen partnerships include Keira Knightley, who he acted alongside in the film The Duchess.
And, of course, Mamma Mia! where chemistry with his on-screen fiance, Sophie, played by Amanda Seyfried, seeped into reality and the two have been dating ever since.
It's thanks to Mamma Mia's phenomenal success that Dominic is now a big name player in Hollywood. Asked how easy it to traverse between TV and movie projects, he flusters a little.
"I don't define the two. It's a kind of a TV film I suppose and again it's always... it's to do with... I don't really define the two."
"I like to make whatever is of quality or is something that you care about, a subject matter that you think will interest people and interest yourself.
"Mamma Mia's been wonderful because I'm able to have much more varied choice of things now which is great."
Another result of the film's success was being asked to appear in an extravagant song and dance number alongside Hugh Jackman and Beyonce at the opening of the Oscars in February.
"That was ridiculous! It was (Moulin Rouge's) Baz Luhrmann directing which was just brilliant," he says.
"And to be dancing on a stage in front of every one of the most famous actors you could ever imagine, trying desperately to do this dance routine, yeah, it was completely surreal."
Extra time - Dominic Cooper
Dominic was born June 2, 1978, in Greenwich, London.
He graduated from the London Academy of Music and Dramatic Art in 2000.
He's best friends with Gavin and Stacey's James Corden.
First came to people's attention in the award-winning theatre production of Alan Bennett's The History Boys, alongside James Corden.
His romance with Amanda Seyfried began while filming Mamma Mia! after he ended a 12-year relationship with girlfriend Joanna Carolan.