Help me free my nano!

Basic science here -- heat expands things, cold contracts. I think you can safely try a little heat to expand the case to loosen its grip on your Nano. The trick is that you need the case to expand faster than the Nano so that it spreads out faster than the Nano grows (we're talking microscopic changes here, but perhaps enough to break the bond). The thermal mass differences between the Nano and the plastic case should allow the case to expand faster with a little heat.

So, try using a hair dryer to gently warm up the case and then try to slip the Nano out. Don't go crazy with the heat, just try a little at a time. If that doesn't do it, you might first try the opposite by putting the Nano & Biscuit in the refrigerator for maybe 15-20 minutes, then pull it out and gently blast it with the hair dryer. The cold will cause both to contract a bit, but then with a little heat the case should expand faster than the Nano.