Mike and Sulley meet and kill each other. Mike wins. Then kills Dean Hardscrabble. They both eat everyone else at Monsters University. The End.
This, along with Monsters inc, left the Children frightened and afraid because they thought that monsters were going to scare the crap out of them. Parents also did not like it, because it would make them have nightmares. The Parents said that they rather watch Thumper Vs. The Teletubbies.