Not only is today Halloween, more importantly it is also Reformation Day, which is basically the anniversary of Martin Luther nailing his 95 Theses to the door of the church. I've always thought that it might be fun to print out the 95 Theses on 8.5X11, staple them together, and tape them to the door of the local Catholic church. Haven't gone through with it yet...maybe next year.
On a related note, a few weeks ago I rented Luther on DVD. It wasn't the best movie, but it's worth a rent if you're interested in the subject.