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[Hutch327]

Hello
I recently saw a video where the fortress was being invaded by goblins.  One of the hallways was "rigged" somehow so when any intruder walked down the hallway the floor would drop out and they would fall into a room where there was a forgotten beast that would do the dirty work.  I am not sure if it was a bridge attached to a lever that was pulled and made the floor drop out or what.  Any insight would be great! Also, how  it would be constructed. 
Thanks in advance

[FourierSeries]

The technology you are looking for is called a pressure plate. It functions more or less as a lever and is triggered by something with enough weight (as well as a few other configurable conditions or targets) walking over it. The plate is linked to one or more retractable bridges. Your biggest problem with this setup is one of timing as it's not instantaneous. After the plate is triggered there's a considerable time lag before the bridge retracts. Your design must include a guesstimate of how long the bridge needs to be to keep the victim(s) from sprinting across it.
Fair warning, expect some surprises. Like, what if the FB decides to climb the wall and hang there right under the bridge waiting for it to open?
Typically, once I get the gist of some technique in DF I prefer a DIY approach, including the reliably predictable screw ups that will follow. So, I'll defer to anyone else who wants to lay down an infallible blueprint for such a system.

[eerr]

note that timing is shorter and more precise with higher quality mechanisms.