The next person to walk into the toilet is in for quite a shock, and then eventually when they do switch the water back on they're in clog town. Water floats to the top of the bowl, goes everywhere and the poo should float out to freedom.
At the point, you push out your steaming turd so that it sticks to the ceramic part of the bowl. It creates a giant mess to clean up. Make sure you are not seen leaving the bathroom as a beat-down might ensue if you are caught.
A common double whammy is to also pull an upper tank or upper decker. This will create total havoc for the toilet & the person that owns it.
Entire commodes have had to been ripped out and replaced because of the devestation this creates.