Step 1: You will need . . .
For the "Pillar of pain" you will need the following, most of which can be purchased at the local hardware store:
4" x 10' PVC solid sewer pipe
4" PVC end caps (x2 for each end of the pipe; there are variants to what type of end cap that can be used)
PVC cement (make sure if you are using PVC use PVC cement; for ABS use ABS cement)
Waterproof permanent Marker