Invoke this dread weaver yard decoration from lawn bags and leaves.
To create the spider's body, stuff one trash bag full of dry leaves (you can also use crumpled newspaper). Tie the bag closed, then flip it upside down. To make the head, stuff a second bag (not as full as the first), tie it closed, and tape it to the body.
To make one of the legs, roll up two garbage bags together lengthwise. Wrap them with electrical tape at both ends and at two points along the leg to make joints. Roll up seven more legs, then cut four small slits in each side of the spider's body and slip the legs in place.
Cut the white lip off two of the red plastic cups, then tape them onto the spider's body to make his beady red eyes. For the fangs, cut two triangles out of the third plastic cup (or another piece of white plastic) and tape them onto the spider so that the white side faces up.
Perch the spider atop a big pile of relatively dry leaves. To create a web for her, simply weave and tie lengths of clothesline or twine across your porch. For an extra scary effect, tie a few unlucky stuffed animals to her web.