Submerge the bottom glass in hot water, which will expand it…then pour ice-cold water in the top glass, which will contract it. Once you have the hot-and-cold thing happening, you should be able to pull the glasses apart easily.
More help with your glassware…
- How to Clean Fine Glassware and Bottles
- A Cure for Your Cloudy Drinking Glasses
- The Secret to Spotless Crystal