The kids gave this to me for my birthday last year, right after we discovered the show. My wife and I have birthdays 1 day and 1 year apart. We are the "same" age for one day a year! We spent our day last year in Montreal and the kids brought my presents with them for me to open.
I had lunch with some former colleagues today. One remarked that she liked the shirt and commented on how prolific the fireflies were in Vermont this year. I pointed out that the shirt was referring to a television show. She essentially gave me a "No duh" and told me how much she had liked the show! Totally out of character for her and reaffirmed why I cherish her friendship.