Check out this video from Twilight F/X showing off the Ghostbusters’ Proton Pack going through the venting sequence.
This thing is A-MA-ZING! The attention to detail and the hours spent crafting this movie prop is fantastic, and I have a great deal of respect for people who are mechanical enough to build these works of art. Yes, I consider this a work of art, but I still want to strap one on and run through a comic convention screaming, “The green one is getting away! After it! After it!”
Check out this full demo in action.