Do cruise ships bring the rain? The mysterious difference between causation versus correlation

I was complaining to a local friend last week about the rain here in Vanuatu. It rained every day for 2 weeks and I was going a bit stir crazy. “It’s the cruise ships,” my friend told me.  Really?  “Yes, every single time a cruise ship comes to Vanuatu, it rains.  Everyone in my village [...]