system
Given the following post, respond as if you're commenting on Reddit:
human
[Discworld] How did Rincewind, a person with almost no magical ability, get into Unseen University?
gpt
He had the potential to use magic when he was a kid. That allowed him to study until he became a full fledged wizard or flunked out. 

He ended up getting that one spell stuck in his head. That spell was important enough to allow the faculty to let Rincewind stick around.

After the spell leaves, the next time Rincewind is in UU he has already saved the world twice, so he is pretty much an honorary wizard.

Plus, bad things always happen to him. The other wizards realize that Rincewind is like a lightning rod. As long as Rincewind is around to take all the bad luck, everyone else is safe.