Answer: 1, Super Bowl V
As you can see I'm somewhat obsessed by Super Bowl trivia. When I lived in NY, WFAN sports radio gave away 5 trips to the Super Bowl, one a day during the week before the game. You had to answer 4 questions. 1st 2 were easy, 3rd was hard, and the 4th was very hard.
Just getting on the air was nearly impossible since the phone lines were severely jammed during the contest. Then they started giving callers only 5 seconds to answer because people were stalling while they were looking up answers in books or on the internet.
I never won but I got to the 4th question once. This was the question that I had. I guessed 2: Super Bowl 5 & 6. If I didn't say "& 6" I would have won.
Dallas lost Super Bowl 5 wearing their blue jerseys and then won Super Bowl 6 wearing their white jerseys. They've been superstitious ever since and have worn their white jerseys in every Super Bowl after that.