Doesn't it make you cross...

[Wilbro]

Simply lifting the edge of the lid just enough with a coin or screwdriver breaks the seal and lets air in without spoiling further use of the lid.

[Char]

Probably most of if not all of the above.
I have problems with the glass phials that some of my medicines come in, I can never break the end off of the blasted things without cutting my self.

Bugbear of nurses everywhere,they’re forever slashing their fingers

Yes, been there. Some are easier to break than others, so I always use a tea towel or J cloth !

My bugbear is the flip top on water bottles (yes, we do use gourds and tap water as well) - impossible to open without splashing yourself.
But at least tooth brush wrappings are easier than they used to be.

Like @Doug I always run jars under the hot tap before attempting to open. If that doesn't work and I don't want to keep the jar, I pierce the lid with a bradawl which always works.

Thanks Blaze - that works no more cut fingers and thumbs.

Re; the flip top water bottles, I cover them with a tea towel when I open them to stop getting splashed.