If your blender's bottom is stuck on, don't despair—there are a few things you can try to get it unscrewed. First, make sure that the jar is empty and dry. Next, see if you can twist the bottom off by hand. If it's still stuck, try using a rubber band or a piece of cloth to grip the bottom and twist it off. If all else fails, you can try using pliers, but be careful not to damage the jar.