I must admit I haven't been talking like a pirate today - and I should be keelhauled for that - but I did pop in the remake of Sid Meier's Pirates! to take advantage of the once-a-year easter egg that changes all the in-game text to be extra "piratey"; including the governors and their daughters, which is pretty amusing. And yes, I know I could change the date on my PC to take advantage of that easter egg any time I like but frankly, that would be cheating.
And then there are those who take it very seriously indeed.