I'm still working my way through Heavy Rain, and I'll save my comments about the game until I finish. For now, I broke it in an interesting way that's worth sharing.
When you are playing as Norman Jayden in the police headquarters, it is possible to go into the men's room. One plot element requires this, but later you can visit again to regain your composure or to relieve yourself. It's a nice touch.
I found myself wondering if I could pilot Jayden into the women's room, which is right next door. The result was unexpected and sort of lovely.
To enter, wait for a woman NPC to open the door, and then shimmy in after her. You'll have enough time to do so if you're quick about it. However, once you do, the game registers that Jayden has entered the bathroom scene, and it changes the camera view accordingly, showing the interior of the men's room.
You'll be stuck behind the wall and unable to continue without restarting the scene, but the result is a strangely calming restroom simulator. Men come in and out, making use of the urinals and basins and then departing again. You could just leave it running, like a very strange kind of simulated fireplace, one that displays a bathroom.