Paul Spooner made an automaton revealing his take on the extinction of the dodo, in the Cabaret Mechanical Theater, which was once in Covent Garden, London. It was copied to make a toy that could be sold, and someone recorded it in action. https://www.youtube.com/watch?...

In the low-temperature physics lab at Caltech in the early 1970s, one of the grad students was already warning about the waste of helium from natural gas wells, projecting a future shortage. Not a lot was done worldwide, except to compound the problem by drilling for more gas.

They don't initiate lawsuits in August anymore. Only in the other 11 months.

Probably the best approach. You could suggest a passphrase or two from some joke or story or nonsense remark you share with your sister, that the parents don't know about, even something that used to make her mad when you said it. Then, if she didn't want you to know the passphrase, she could pick something similar from some interaction with a different friend, imaginary or real. It might even contain some punctuation. She won't have any trouble remembering something like this.