Don’t Run. Turn the Valve
Every toilet has a shut-off valve connected to hose coming out of the bottom of the tank. If your toilet is about to overflow, turn the valve to the right to shut-er-down instead of panicking and calling the plumber.
Once the water is shut off you can generally plunge your way to safety without having to get the fishing net out for scooping. Remember: right tight to turn it off. Righty-tighty?