My ndn is a bit different - guy in his 40s, in the two years I've lived here only ever seen what looks like his mum visit a few times, he's never away at night (very noisy car that makes my windows rattle so know when he gets back every day), has a pet rabbit, cleans his old crappy car very carefully every week, drives a few mins down the road to the corner shop to pick up microwave food. I think he might be autistic or something, do you think I should make more of an effort to be friendly?