what mod are you using?
And:

Welcome to the recently re-modified Hard-Light Productions Bulletin Board. The worst rule you can break on our humble forums is putting the symbols S, F, and 3 in the (im)proper order. Don't go into the ductworks if you can avoid it. If you do, bring a lunch, and when you see a cluster of red glowing eyes, drop your lunch, and slowly crawl backwards. Flamethrowers are located under your seat, but due to the suckiness of our last server, they only have holy water. Be wary of the
hyperintelligent shade of blue, we know next to nothing about it, other than the fact that it has stolen a few n00bs.