Q:Have you ever hit the top of a glass juice bottle with your fist. It makes a very loud cracking sound. It's not the lid, and you don't have to hit it that hard. You can turn the bottle up side down hit the glass side of the bottle and it will make the same sound. However, it will no longer make this cracking sound after the bottle has been opened and resealed, or with a plastic bottle.Try it! I think it has something to do with vacuum sealing but I'm not sure. Can you explain this?