"Cor blimey guv'nor!" is apparently where the majority of dialect coaches start when it comes to teaching the many intricacies of the British accent.
And while many have managed to master the hard t in city without sounding like a parody, others have failed. And oh how they've failed.
Here are the nine very worst attempts at a British accent ever in cinema. Let us know if we've missed off your pick at the bottom
Noomi Rapace - Prometheus
While many assumed that Rapace's character was simply non-specific European, weirdly, for all those with both working ears, she was actually supposed to be English. Admittedly she was raised in South Africa but, given the Swedish twang of her voice, that information actually makes everything even more confusing.
Josh Hartnett - Blow Dry
While you've probably never seen Blow Dry, the comedy about the British Hairdressing Championship (??), you've undoubtedly heard the legend of Josh Hartnett's astonishingly bad Yorkshire accent. Impossible to replicate, it's really something to be savoured. Except if you're from Yorkshire.
Anne Hathaway - One Day
Speaking of ear-crushing Yorkshire accents, here's Anne Hathaway taking on her most challenging performance. Well, vocally at least. Unlike Renee Zellweger and Gwyneth Paltrow before her, Hathaway struggled to convince as a Brit. You've been warned.
Dick Van Dyke - Mary Poppins
The bad Cockney accent that all others are measured by, Dick Van Dyke's casting in Mary Poppins remains a compelling mystery. Largely indecipherable and permanently distracting, he's luckily made up for it since with countless episodes of lunchtime mystery drama Diagnosis Murder.
Keanu Reeves - Bram Stoker's Dracula
Quite what inspired anyone involved with Francis Ford Coppola's gothic adaptation to cast Californian Keanu Reeves as the completely 100% British Jonathan Harker is still a bizarre and potentially unsolvable mystery. This succinct clip is a perfect reminder of just how misjudged that decision was.
Shia LaBeouf - Nymphomaniac
All that time denying his fame and wearing a bag over his head didn't allow poor Shia LaBeouf much time to concentrate on his London accent in Lars Von Trier's arthouse porno Nymphomaniac. Which, on reflection, even he must see as quite the mistake.
Mischa Barton - St Trinians
Despite the fact that Barton was born in Hammersmith and lived here during her early childhood, this attempt at being a convincing English girl is, ahem, a tad skewed.
Russell Crowe - Robin Hood
A touchy subject here as hot-headed Australian Russell Crowe attempted a Nottingham or Sheffield or something accent in Ridley Scott's poorly received take on the legend of Robin Hood. Crowe was particularly sensitive about the exact whereabouts of his dialect and walked out when it was brought up during an infamous interview with Mark Lawson.
Natalie Portman - v fOR vENDETTA
A valiant attempt here but a failed one nonetheless. Natalie Portman's lead character in the dystopian thriller V For Vendetta has a clipped posh accent that sounds like no one you've ever met. But then the film, which also sees Aussie Hugo Weaving star as V, is one of the least British-feeling films ever to be set in Britain.
(Images: All Star)