Heavy Rain - sit on table AND chair at the same time
You guessed it, it's not super useful. But the mechanism behind this glitch offers hope for other glitches elsewhere in the game.
Basically, during the chapter Eureka, while chatting with Lauren, there are extra prompts for leaning on the table, wall, and whatnot. As usual... Should you choose to sit down on your chair, right as the animation ends you can momentarily select the prompt for sitting on the table as well. So be it! As a result Shelby glitches to and fro between the two sitting positions. After rising up from the table, Shelby ends up on the chair, but resting uncomfortably with the armrest penetrating his stomach and sometimes buttocks.
I'd like to glitch this game some more, but I find it frustrating that most of the game is unskippable cutscenes. Also, most of my resources have gone to non-gaming things this month. For example, I'm doing a FAWM (February Album Writing Month).