I used to have reoccuring dreams that there were two skeletons living in the crawlspace of my basement. I had my mom worried for a time because I was always waking up screaming and sometimes I would draw them like killing me and stuff (I was about 7 at the time, pretty morbid IMO.) It finally stopped around the time I was 9 (most likely because we moved to a house without a crawlspace, and a basement thats actually just like any other floor of the house.)
But yeah, those fuckers haunted me for like 2 and a half years. I still don't like basements with crawlspaces.