Here's what you want to do: First have a very stern talk with it, but don't yell. Next run it over with a cement truck. If that doesn't work, take it back to the store and complain about the jar not cooperating and go on a big rant about how jars aren't like they use to be and how the world has changed so much. Then break down crying in the middle of the store. The lid should pop right off after that.