I also had a little bit of fun explaining to New Zealand immigration when I was heading to Waimarama Do on the tail of my European trip; there is a question on the incoming immigration card that says, "List all the countries you have visited in the last 30 days".
I had fun with a similar question on the US immigration form in MIA - fortunately the questioning was brief, but they wanted to know why I'd been to all the places I'd been. I wonder what the reaction would have been if I had said "collecting miles"...