Whew!

Well, that's odd, because I can't think of where it would go! If anything, I would think the disc would be over the tray -- or somehow behind it. If it's behind it, then good luck. I wouldn't stick any metallic objects in the open player, but can you get a finger in there to feel the top (roof) of the player when the tray is open?

If another disc plays, I guess the other one isn't in the way. If you're lucky it may shake itself loose and fall onto the other one (which would probably cause quit a racket). To play it safe, though, I'd probably take it somewhere to have someone take a look.... you can bring it here, if you want.