[AnimalMuppet]

Heh. When in serious need, break out the giant ChannelLocks, and have someone else hold the jar. A foot of leverage can move most lids...

[fdsajfkldsfklds]

Or just gently dent the edge of the metal lid, enough to break the seal, and it'll open easily.

[rekabis]

> just gently dent the edge of the metal lid, enough to break the seal

I think you need to know about the JarKey (https://www.amazon.ca/dp/B00167Z2UO/). Does the job without any risk of damaging glass or even the jar lid itself.

[bell-cot]

With only one person needed. And denting can usually be done with an old-fashioned can/bottle-opener, to minimize the chance of cracking the glass jar.