Saltburn, in which his character has sex with a grave, was not originally part of the script.Emerald Fennell’s black comedy has become a social media sensation since its release on Amazon Prime Video last month, with a number of its more shocking scenes – including the infamous bathtub moment and “vampire sex” – emerging as hot topics for viewers. However, it’s the unsettling grave sequence that has really got fans talking.The film stars Keoghan as Oliver Quick, a middle-class Oxford student who struggles to fit in with his wealthy peers on campus, until striking up a friendship with Jacob Elordi’s charming aristocrat Felix Catton.Oliver is eventually invited by Felix to spend the summer at his family home, called Saltburn – a large mansion in the British countryside.The twist at the end of the film reveals that Oliver actually killed Felix, leading to the chilling moment where he penetrates the mud of his freshly dug grave.“On paper, he wasn’t written to do that,” Keoghan revealed to Variety.