The king is evil, and hard to please, he doesn't easily laugh. What would you do or what joke will you tell him to survive?

Imagine you discovered a passage to a secret room in your house. What would you do?

If you could travel to any time period & place and have the ability to do something about a single event of your choice, what would you do and how would you go about doing it?

What if you somehow found that you're a clone of an unknown rich person? and you ignore the details of what/how it happened?

Imagine that various types of insects and arachnides become 100 times larger in size than what they really are. Assuming that they can survive with such size, can humanity survive? What would we do?