When two glasses get stuck inside each other here is what you do. Place the base of the bottom one in hot water up to its edge and fill the other one with ice (or cold water). The bottom one will expand and the top one will contract, thus relieving the pressure. When my brain swells I fill the sink with from the cold tap and I dip my head in it, I get immediate relief which astounds me because the scull transfers the cold to the brain, it works every time and it is not anything I read or was told by a doctor. I want to pass it on.