One fated Halloween, 500 years ago, Martin Luther nailed his 95 theses
to the door of Wittenberg Castle in a dramatic act of defiance against
the Catholic Church.
Or, he may have just hung it on the doorknob. Or mailed out copies. Or, if he did nail it, the act of the nailing itself would not have been all that significant, because the door may have been used as a bulletin board where everyone was nailing announcements.
https://www.catholicnewsagency.com/news/what-caused-the-reformation-a-catholic-explainer-90517
Or, he may have just hung it on the doorknob. Or mailed out copies. Or, if he did nail it, the act of the nailing itself would not have been all that significant, because the door may have been used as a bulletin board where everyone was nailing announcements.
https://www.catholicnewsagency.com/news/what-caused-the-reformation-a-catholic-explainer-90517