Question: The ocean tide was dangerous. What is the effect?

Answer: The swimmers returned towards the shore.

Question: My mailbox was overflowing with letters. What is the cause?

Answer: I went on vacation for two weeks.

Question: The speaker disarmed her debate opponent. What is the effect?

Answer: The speaker won the debate.

Question: I poured water on my sleeping friend. What is the effect?

Answer:
My friend awoke.