Twilight entered the bathroom with a desperate need to poop hard with a book. She got her butt on the toilet and begin to push while opening her book and reading it.  
TS: oh dear celestia, this one is really big. She said while grunting and pushing out a large log and it drops into the bowl splashing her butt.  
TS: oh great, and my butt is gonna get wet. She said to herself while pushing another large log.  
It was hard for her to read a book because more large logs were barely leaving her butt and they were splashing her butt more.
 
20 minutes passes and she pushed out the last large log and it splashed her butt again. She then grabbed some toilet paper with her magic and wiped her butt from the poop and water.  
She got up after wiping her butt and flushed the toilet, but of course all the large logs caused her toilet to get clogged.  
TS: oh are you serious? Come on!  
It took a while for her to calm down, and when she did, she called a plumber to fix her toilet.