You want to have fun? Try plunging your toilet, only to have sewage back up into your bathtub. Then go outside to the spot where the pipe meets the sewer and see water (you wish it's only water) dripping into the crawlspace of your house.
Yeah. I should be in bed right now.
UPDATE: Tree roots. You could actually smell them as the snake was cutting through them. There were at least four sections where the plumber had to back the snake out and push it back in to deal with the roots. We'll see how long his clean-out job lasts, but with the sweet-gum trees around here, it's only a matter of time before they plug it up again.