Looking for a certain WAD...

[Dirk]

It's been a while, so I might not have the details exactly right, but I remember a room with a cage in the middle of it.  You had to go into the cage to pick up a key, but once you did, the cage sealed itself off and some monsters started to spawn into the room.  The only way to get out was to shoot a switch outside of the cage.  IIRC, you couldn't hit the switch with the shotgun (or at least it was very difficult to do so), so you had to use the pistol (I can't remember if the chaingun was available at the time).  Does this ring a bell for anyone?

[DMPhobos]

You might want to ask that here

[Dirk]

Thanks!  Sorry for creating this thread; I didn't know about the other one.