Another forum I frequent uses vBulletin, and they heavily customize it, and something I saw they do is called "spoiler tags"

Basically in your post you do [spoiler][/spoiler] and anything within the tags will be posted as black font and black background and put a spoiler title on it. So it looks like a block of black, but if you highlight it you can see what was written. It's a nice way of telling certain people stuff without having to move it to another forum/area. And of course there's enough warning to deter people who really don't want to know about it.

I thought it would be useful for a forum like this and wondered if that was possible with this forum software.