Yeah, I've installed a ton of tricks on these forums.
When you go to post a new thread or reply (not available on quick reply) you will see a smiley that has tape over his mouth. That's the spoiler smiley. You could either use him, or type the code manually.
[spoiler*]Gangsta[/spoiler*] Be sure to remove the stars. I had to type it like that so it wouldn't just show a spoiler instead of the code. Without the stars your output should look like:
We're going to break the forums with our awesomeness

Dan has been hitting the bottle again.
What's up, Dan?
Bojangles Wrote:Dan has been hitting the bottle again.
What's up, Dan?
Oh, not much. Just trying to think of something to say...
MPR_Dan Wrote:Oh, not much. Just trying to think of something to say...
I hear you, man. Nice to see you posting.
