So how do all those little spiders get inside your home? The ones that kind of run along jump along the grass? They hunt organisms like these pincher bugs and other insects down deep right along the foundation where the grass meets the foundation. What happens, though, is that these running, hunting spiders will set up camp inside what we call the "weep hole". That's a gap between the bricks that allows moist air to escape your wall. That moist air draws insects and they'll set up camp and nest back there. Unfortunately, when they lay their eggs, their eggs are inside your wall. Two-to-six hundred babies will then hatch inside the wall and you'll start seeing little tiny spiders running around the corners of your home. You'll also see little cobwebs set up in the corners. This is where it comes from.