Dangerous spiders you've seen, heard of etc.?

[Kriven]

Here's a different fact about the daddy longlegs though:

Most of what I call daddy longlegs "spiders" are actually harvestmen, a totally different arachnid that can't even spin webs.
Some are also actual spiders, specifically cellar spiders (members of the pholcidae order, most of which are characterized by that spindly legged look).
All things with eight legs are creepy as fuck, proper species regardless (octopi have arms, so they're cool).