Pro tip: There are tools specifically made for opening jars so even if they do that, just get one of these tools and you'll never have to ask someone else to open a jar for you again. There are also ones that work with different sized Jars and even twist off bottle caps as well.

Here are some pictures of them by the way (in case anyone is in doubt of their existence):

A standard traditional one (this is what I have)

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This one is marketed as "arthritis friendly"

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This one is an alternative one similar to the first but with a different method of selecting size.

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