I tried getting one of those rubber things to open it and I still can't do it. I feel weird asking a neighbor. How do I get it open? Doesn't hot or cold water help?
NVM, I got it.
I've hit the side of a spoon on to the lid of a jar (the side of the lid) and it pops open. If you can bang the side of the lid on the jar on something hard (try not to damage your counter top - I learned the hard way it can).
Hot or cold can help but it opens every time when I bag the side of the lid on something hard, yes I have done it on the ground outside and it opened without spilling.