Very old and therefore uneven massive board for cutting vegetables? Wipe it with sandpaper, and it will again become smooth.
You can’t open a glass jar with canned goods, but there are no men nearby? Or there is, but there is no sense in it? Put the jar for several minutes in hot water, and it will easily open. Naturally, this cannot be done if the bank is just taken out of the refrigerator — bursts.