The "leave something with friends/neighbours" option is interesting. That is, after all, what we already do: we have a set of keys for one of our neighbours' houses so we can pop in and walk their dog when required, and they still have a set of ours from when they used to pop in and feed our cat (RIP). They could, of course, come round and ferret through our drawers - but we would be able to work out they had pretty easily, even without the presence of a security camera. So: should our approach to digital security be the same? A trusted third party who could use your passwords, but if they did you would get notified?