I've flown quite a bit so I don't really get nervous when I have to take a flight somewhere. However, if I was sitting on a plane and the flight attendant started ranting about the plane crashing, I might have an issue or two.
I do like how the story mentions that the attendant was "subdued". While I wouldn't have liked the delay so much, it was probably quite an entertaining spectacle to watch for the passengers on board and it sure does make a great story to tell your friends and family.
File that under flight attendant breakdown.