You could probably get it with the trigger sets in the miscellaneous downloads section, but I recommend downloading and installing Reyk's new editor. It's basically a much better version of the scenario editor, and has some extra triggers like "load scenario."
Pears: ok i downloaded a few scenerios and it says place the mp3 folders in the "sound" folder but i cant find the sound folder any where please help!
Elpea: Your sound folder is right next to your fart sounds folder.