Open screw cap - injury-free and without tools
It often happens that screw caps from jam, cucumber or mushroom jars are difficult to open.
I used to handle knives, scissors, I tapped the glass on the edge of the table, turned the glass and hit the floor rarely worked.
Now I do it as it showed me the mother of my girlfriend: boil water (kettle), the glass with the lid for a few seconds hold in the no longer boiling water, turn glass, towel around the lid (the lid is now yes hot) and turn up.
Ferdisch. Injured and without shards :-) Works in 98% of cases.