Some of the people might be really afraid of spiders, little creatures that crawl into the wall. Sometimes it can be really naughty, falling from the ceiling, with the thread still attached to its butt makes the eery feeling even stronger.
But for some, it might just be a little cute creature, and it won't come to you as a nightmare. They are not big enough to snatch you and wrapped you with its powerful silk thread before sucking the liquid out of your body.
Trust me they are beautiful. : )