LOL - why not make a room.
Put a Dharma Logo (with the lost music in background) in it then make a bunch of monitor looking things and put in all the videos that you can see from halfelife-2 - ie nova prospect and a door with teleport that takes you out.
or
Same room 1 monitor - big chair you can jump in - with table light & popcorn. Jumping into the chair turns on the tv - it turns on one of the TF2 movies that you would see at the begining of a map but in this case you can watch Gordon freeman battle is out with the aliens or something. At the end of the movie a transparent door on the chair moves out of the way exposing you to a teleporter - taking you to a zen like area - You see a teleporter vortex, hear Nilah sayinging, "Freeeeemaaaannnnnnn" followed by Kliner yelling, "Freeman you must jump NOW!!" into the vortex you go or trigger hurt comes on and kills you. Jumping into the vortex takes you back into the game. Only one person at a time can go into the sequence so you'd have to time the entering of the room right.