NOTE: There is a known issue with the most recent entries having screwed-up information and links. Some databases are out of sync and we haven't been able to fix it yet.
Load this WAD into DOOM II (i.e. DOOM2 -FILE AMBIENT.WAD), in the "Options / Sound Volume" menu turn the "SFX Volume" all the way up and the "Music Volume" all the way down, select "Fist" and punch one time. I figured that this WAD might give authors some ideas for adding ambient sounds to their levels.