Display Viewer Name in Signature?

[GatorV]

Hi, I've seen a really cool signature in another forum where he places:

I'm watching (UserName) so be careful

it automatically replaces UserName with the name of the current user viewing the thread how can he do it? with a BBCode?

Thanks in Advance :squareeyed:

[Chris M]

Install the [you] bbcode hack ;)

Chris