We had a lot of rain in a short period of time this afternoon. The storm drains run into the sanitary sewer in this old neighborhood and the sewer system couldn't handle all the water. As a result we had rainwater, sewer water and silt gushing out of the toilet and shower drain in the basement. It's a bit of a mess.
Probably need to look into one of those flapper/check valves that prevent water from the sewer from coming back into the house - so we don't have to go through this again.