I love mysteries: reading or writing them. I have often pondered some historic mysteries. I have recently written about one famous one, which is remembered at this time of year. See which explanation you believe and what do you doubt? Whatever you think, I expect it has nothing to do with chocolate eggs.
http://ezinearticles.com/?Have-You-Tried-to-Solve-This-Famous-Historical-Mystery?&id=9681903