Good Pope John (John XXIII) dies and goes to heaven. He meets St Peter at the pearly gates and tells him his name.
St Peter looks down the list and says "I'm not seeing you on the list, hang on a second"
After a few minutes the Holy Spirit comes out and says "You say you are Good Pope John, did you do something we should remember?".
Good Pope John looks at him and says "I convened the second Vatican council to reshape the Catholic church"
The holy spirit looks puzzled for a minute, then says "The second Vatican council, I remember now, I was supposed to go to that."