How do you add a *spoiler* to your siganature?

[Bug-eyed Earl]

How do you do that? Just asking, I would like to be able to.

 

[Rapstah]

Spoiler

[spoilah] tags.

 

[spunge]

Spoiler

i bet everyone who looks at this thread had to click it..

 

[co05]

Spoiler

Someone doesn't get it! lulz.

 

[Hectic Glenn]

Spoiler

Insert text here[/ spoiler]

Just remove the space between the / and s