If you have drinking glasses that are stuck within each other, this trick will release them quickly. Fill the top glass with some ice, then dip the bottom glass in some hot water, or run hot water around it. Gently twist and they will come apart. I did this several times after going through old drinking glass sets I'd put in storage to donate.
There is nothing more frustrating than trying to separate pots that are stuck together before being able to cook. Check out these tips and tricks for Separating Pots That Are Stuck Together.
Ice and hot water is usually the best method for separating glass or ceramic dishes. This is a page about separating Fiestaware that is stuck together.
Often removing a plate that is stuck in a frying pan can be accomplished by heating the pan up a bit. This is a page about removing a plate stuck in frying pan.
This is a page about unsticking glass dishes. It can be frustrating trying to get glass dishes apart without breaking them.
