Well garden spiders also don't pose any harm, but I don't fancy getting into a giant ball of them

Their saliva is mildly toxic so if you're unlucky enough to be allergic you could get an annoying rash from a bite.

I had one draw blood this spring! Granted, it was barely anything, but it still blew my mind it was capable of doing that.

They do bite. It doesn't really hurt but it's shocking when it happens.