You can definitely tell that it's a laboratory on some kind of spaceship. There is a glimmer of light from one side of the room, and you make your way to it, pushing through the dense foliage.
When you get there, you see round windows, just like those of a spaceship, and the stars that you can see in it just proves your point that it's a spaceship you're in. But that's impossible! How on Earth could you be inside your friend's house, but on a spaceship?
Then you realize. Maybe you aren't on Earth at all. Maybe someone abducted you in your sleep and took you away to this planet, and made you meet a copy of your friend. You get the shivers impulsively. Then what planet are you on?