Note: They're not spiders, they're Opiliones (aka harvestmen, daddy longlegs). Unfortunately, that doesn't make it any less terrifying.
This is a furry looking clump that, when poked with a finger, produces nightmares (previously: this one). I dare you to eat something spicy then watch it right before bed. Wait -- did you just feel something on your leg?
Thanks to Nicholas and IADM, who agree some furry looking balls are better left unpoked.