The Hollywood Version:
It seems that back in the '70s, there was a plucky little football player who dreamed of nothing other than playing for the Notre Dame Fighting Irish. Unfortunately for young Rudy, his support system consisted of people who went out of their way to point out his flaws, of which there were many, and let him know repeatedly that dreams are the main ingredient in the devil's pudding.
Thankfully, Rudy's best friend from back home got blown up in a freak accident, inspiring him to play football for some reason. And play he did, no thanks to the evil scheming of Notre Dame coach Dan Devine, who only allowed Rudy on the field after the entire team threatened to walk out otherwise.
In reality ...
The real life Dan Devine was actually the one who insisted on playing Rudy in his final game. Hell, even when the movie was being made, Devine gave the filmmakers permission to turn him into the film's villain in order to help Rudy, who he considered a good friend.
Devine sounds like one helluva guy, right? So naturally he was repaid for his kindnesses by being turned into the Snidely Whiplash of college football (sans mustache), and forever being remembered as the crotchety coach to whom winning football games was more important than anything. Anything other than ensuring that Rudy's dream would die.
By the way, ever wonder who saw Rudy play that day and got so inspired he just had to make it into a movie? Nobody. It was Rudy himself who spent a full decade trying to convince studios that his life was so awesome it deserved a movie, before one of them finally relented. That's the spirit, little guy!
"Son, what are you doing sleeping in my daughter's dormroom?"
-"Uhhhhh, i got to go, im late for class."
-"Its Saturday morning."
-"Then im really late for class. Where are my pants?"