My favorite/most memorable post is [Interviews] with Bitcointalk members started by zasad@, this topic was really interesting to say the least, quite a lot of reputable users, as well as users that have been in the forum for a very long time were interviewed and we got to know things about them that we would prolly have not known if that interview wasn't conducted, the post was also educative and entertaining, it definitely stands out as a memorable post in this forum.