Someone installed the Plumbing wrong. Instead of the water going down into the main lead, it's taking the other toilets route and flooding over, an easy fix unless you have to tear up the floor.
Depends where the house trap is located
If your toilet is flushed xD Jk but if you have a ghost haunting your house it'll enter any room
As water drains, it displaces air in the pipes. If the vent or vents in your house are clogged up, the air must find another way out, which could be another drain in your house.
no offense, but u need professional help!
think the drain may be slightly blocked. Your best bet is to call a plumber now to fix it. If you leave it too long you may have toilet water coming up in other areas in your house. You can try to fix it yourself but most of the chemical treatments don't do a lot.
Good question. All of my cats drink from my toilets and when I had house dogs, they did too. It may be because the water is fresher from being flushed. I have always wondered the same thing.
don't no
Broken sewer line /stoppage
If it was flushed then possibly it ended up in the main house trap if applicable
check your pressure regulator valve or house pressure .Replace fixture stop and ballcock assy also r&r flapper
Virtually every house has at least one toilet.
A Privy, or Toilet