If you've got Half-Life 2 and Garry's Mod you should really go and download this free mod called Elevator: Source. It's about being stuck in an elevator with strangers. Internet strangers. And the elevator can take you anywhere.
That really is it. It's like Chatroulette meets Half-Life. You'll end up in an elevator with....well, freaks, and when the doors open, you could be anywhere.
Get it at the link below.