not so much spooky or strange as OMG! WTF! Aaaarrrgggghhh!! would probably be the badger that stepped out infront of me while descending rather quickly on a night road ride! most sideways I've ever got a roadbike! They're **** big aren't they?
spookiest night ride was actually a road ride too, the night after I went to see 28days later I was out riding country roads after midnight alone and ended up daydreaming (always do on roadrides) about the film, each remote house, hamlet, farm etc. I passed seemed more and more quiet, just the odd one having an upstairs light on but no sign of life, after about an hour I still hadn't seen another living soul. Ok, not that spooky or weird just made me think "what if?"
I nearly always nightride on my own so if I found nightriding spooky I don't think I'd do it.