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There are certain times when it's probably okay to ask a celebrity for a photo - when they've got their pants around their ankles is definitely not one of them.
This was the unfortunate situation Stephen Merchant found himself in during a visit to the doctors.
The 47-year-old comedian spoke to The Sun about the awkward moment, which unfolded while filming a project in Croatia.
When he went down with a serious case of food poisoning, The Outlaws star had no choice but to seek medical help.
But after pulling down his trousers for an injection, nothing could've prepared him for what happened next.
Merchant explained: "This doctor comes and he examines me and he says, 'I'll give you an injection to loosen your stomach muscles. Drop your pyjamas and turn around, because I've got to put it in your posterior'.
"And he gets this bloody great syringe out and he's about to put it in, and he goes, 'Are you Stephen Merchant?'.
"My first thought was, 'Has he recognised me from my behind? Am I like the Croatian Kim Kardashian or something?'.
"So he puts this injection in and goes, 'Don't suppose I could get a selfie?'."
No news on what his response was, although we're guessing the doctor at least waited until Merchant had managed to compose himself.
If not, that picture would've been all over the internet by now.
Merchant's new TV series The Outlaw - a comedy-drama series about a rag-tag band of misfits doing community service - is now available to watch on BBC One.
While the show has been doing well with audiences, a couple of weeks back it was revealed that Christopher Walken painted over an original Banksy painting whilst filming.
You see, the show is set in Bristol, which is Merchant's home town, but also the home town of the elusive street artist.
In the last episode of the series - apologies if you haven't seen it yet, but this won't spoil too much - Walken and other members of the cast can be seen painting over a wall covered in graffiti.
Walken - playing a character called Frank - then comes across a stencilled rat standing on a spray can that was signed by Banksy covered up behind a board.
He asks his probation officer whether he should cover that over too as it's 'awfully good', but receives the response: "Less debating, more painting."
So, he paints over it.
Now, a spokesperson for the BBC has confirmed that the painting was actually a real Banksy.
A statement read: "We can confirm that the artwork at the end of The Outlaws was an original Banksy, and that Christopher Walken painted over that artwork during the filming of this scene, ultimately destroying it."
Of course, this is very much Banksy's style, and probably the kind of thing he - or they, perhaps? - might get right behind.
However, it doesn't mean that they didn't make a costly decision there.
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