The thing we admire about lower primates is not their strength but when they are smart enough to use a tool (like the chimp that uses a stick to catch termites). I usually don't have a problem opening jars: I purse my lips and twist them to one side, give a good effort with my hands (using a wet cloth, i.e. the shirt front that got wet at the sink or that I dried my hands on, for grip if necessary), and the lid comes right off. Usually. Yesterday, I encountered a particularly hard lid. There was no stronger primate around (and even had there been I wouldn't have asked for help because then I would never truly have known if I COULD have done it myself).
So I tried the wet shirttail for grip. I tried the rubber band that comes around a bunch of celery for grip.
I tried running hot water over the lid. I tried standing the jar upside down in very hot water.
I tried a clamp that ds had left by the front door (which succeeded in only denting in the sides of the lid).
I tried combinations and permutations of all of the above. Then in desperation, I almost felt like puncturing the center of the lid with the pointy end of the can opener. Fortunately, I tried the squarish end first. I just put a gentle pressure from it in a few places around the lid to kind of unroll the lip a little. That broke the vacuum seal, and then I was able to easily unscrew the lid. Smart chimp!
Then I was able to make my homemade pimiento cheese with
a little small curd cottage cheese
a little mayo
a lot of fancy shred sharp cheddar cheese
Bon appetit, smart chimp!