There was massive cheering.
This whole jelly donut thing is an urban legend started by the NY Times.
It is not true, German grammatical nuances nonwithstanding.
Gruss Gott.
No, I've heard that speech many times, and he did say, "ich bin ein Berliner."
Ich bin ein Berliner means "I'm a jelly doughnut."
Ich bin Berliner means "I'm a person from Berlin."
I once lived in Germany and often ate berliners, with coffee, for breakfast.