Spoiler tag?

[Jebusman]

I was just thinking about this, and I don't know if it's ever been suggested, but how hard would it be to implement a spoiler tag?

You know, so I could write something like:

[spoiler]The cake is a lie[/spoiler]

And in the post people would have to either rollover or highlight it to reveal it.

Opinions?

[fireXtract]

I like that idea its good if you wanted to hide a bunch of images to not clutter the page or some legal stuff in the BST section maybe!

[bissa]

I'm not sure if I've seen it here. but what I've seen on other forums is

(highlight below for spoilers)
this is a hidden message.