It did happen. In the true story, Pocahontas saved John Smith. It just didn't happen the way it did in the movie and there was nothing romantic between them.
Other famous Johns: John Calvin, John Goodman, John Wilkes Booth, John D. Rockefeller, John Candy, John Hurt, John Wayne Gacy, John Fogerty, John Cena, John Locke, John Deere, John Stamos, John Williams.
Jonathan Swift is a total blindside. Not only he’s the only non-“John” on this quiz, he isn’t even known as “Jon”, only as Jonathan. Plus, there are many famous enough Johns to include instead of him AND “Jonathan” is a different common first name that merits its own “famous …” quiz. My brain just short-circuited itself recalling the name of the author while also saying “John …”.
http://en.wikipedia.org/wiki/John_Rolfe
The "Animal House" hint is a bit ambiguous, as the movie was also directed by a famous John (Landis).
https://www.reddit.com/r/todayilearned/comments/1af1io/til_that_john_lennon_beat_his_wife_and/