Why do we mispronounce words?

‘Expresso’, ‘The Specific Ocean’, ‘Akai bowel’, these are just some of the mispronunciations that drive people mad. But why do people so often mispronounce words? and how can it impact you socially? Anton asked Dr Kirsty King, Forensic Linguist, Lecturer in Communication at UCL and Author of The Language of Lies.