Connected vehicles – cars connected to the internet – are rapidly becoming the norm in the mar- ketplace. Yet, little work has explored user-centred security implications of such devices. Much like other internet-enabled devices, connected vehicles suffer from new security threats while also being vulnerable to persistent existing security threats. However, unlike other widely-adopted Internet of Things gadgets, connected cars could have serious physical ramifications if compromised, including physical injury or even death. This paper explores some likely threats, with the view of promoting more work around human-centred vehicle security.