Showing 23 year old daughter some useful stuff to know. She has a jar of olives she can't open. I tell her to tap on it. She says "what?"
Tap on it.
So I decide to show her. No strength required. Young men, concerned about looking foolish trying vainly to open stuck lids, would need to know this, too, but none are around.
So, I tell her find a heavy spoon or such like object, and tap on the edge of the lid--in the right direction, of course--like this.
Tap tap tap tap tap tap tap tap tap...
...as a cascade of olive-flavored vinagar spills out of the jar which I am holding over the open drawer the spoon came out of.
The drawer needed cleaning anyway.