Damn, but you ask a lot of intelligent questions for a girl! I bet you like football too!
Basement toilet.
No pump.
City Sewer.
Problem is we got so much rain that the storm sewers could not handle the volume of water. When this happens, the storm sewer spills over into the sanitary sewer. When that gets overloaded, water backs up from the street to the house.. you get the picture.
Corked the stationary tub so I did not get sewage coming up there. A neighbor suggested I cork my toilet with a tennis ball (it worked in their toilet) to stop it from backing up.
When I did that, my toilet ate the tennis ball.
I solved my problem, but I want to read some more comments before I give you the Final Jeopardy answer.