"An Easter egg is an intentional inside joke, hidden message, or feature in a work such as a computer program, video game, movie, book, or crossword puzzle."I love Easter eggs. My favourites are Cadbury Mini Eggs and the kind you find embedded in fiction.
One of the most famous Easter eggs was the Superman in Seinfeld. I never watched the show but I knew about it.
I love Buffy's line in Once More with Feeling when she learns her sister Dawn has been kidnapped: "It must be Tuesday." (At the time, the new shows were aired on Tuesday nights.) A similar remark was dropped in The Simpsons about the odd way that no matter how bad things got, it would all sort itself out in a week.
In my own stories, I lean toward Star Trek references. In A Bodyguard to Remember, Pru complains, "I'm a mother not a..." paraphrasing a certain grumpy doctor.
What are your favourite Easter Eggs?