map inspired by a mod (Half-Life 2 or Portal 2)
But if you replaced the trigger_pushes with trigger_vphysics_motions, you could easily make a Pneumatic Density Vent.
What would that look like in terms of gameplay?
That would be interesting. I'm not sure exactly how that could be used as torture or a death trap, but I think I can figure something out 
I didn't literally mean a cannon. It could be a hole in the wall or something, not like a yarr shivver me timbers pirate ship cannon.
Or how about cubes hitting a faith plate and slamming into the player? (I know, you don't take physics damage in Portal 2, but it could be done other ways)
Think of all the things we learned
For the people who are still alive
Or how about cubes hitting a faith plate and slamming into the player? (I know, you don't take physics damage in Portal 2, but it could be done other ways)
Spraying the player with sulphuric acid, huh? It is deliciously evil. I like it!
The cubes could be made to damage the player by triggering... a trigger... that is activated only by a cube and the player both being inside it. The trigger would cause the same sort of damage as the laser while being fatal like the toxic goo.
bump
I hate to double post, but I don't want this thread to be pushed down into oblivion.
You don't need to do that, really.
People have been bringing up some great ideas in this thread, so why don't you try implementing a few of them (perhaps in a concept map) and then post an update with some in-game footage of your deadly contraptions? 
People can then give feedback on those and perhaps come up with some more ideas. This will probably work better to keep this discussion going, rather than just intermittently going *bump* without any other input or sign of progress.
Other Portal 2 maps: Medusa Glare
Portal 1 maps: Try Anything Twice | Manic Mechanic
@HMW: Yeah. You'r right. I just don't want my thread to disappear into the page 2 mess that is old threads. I will update this thread with some in-game pics soon. I may even upload the map to the WIP section. I hope people like what I have done so far.
Other Portal 2 maps: Medusa Glare
Portal 1 maps: Try Anything Twice | Manic Mechanic