[bryanlarsen]

I would argue that this may be one of the best possible computer-related stocking fillers. Used religiously this would vastly improve the security of most users, as explained by the other posters. As well, the conversation it starts may be even more helpful. Explaining why writing down passwords is actually a good idea will go a long way towards educating people about the actual risks of passwords. Maybe you can convince somebody to use a software password manager instead and they'll use your gift for grocery lists. Either way, mission accomplished.