On the trip back, half way through a 13-hour flight:
Son: I know what I'm gonna be for Halloween.
Me: That's months away!
Son: No, wait! I'm going to be a beggar.
Daughter: I'm going to be a whiner.
Me: Oh, goodie.
Son: I'll dress up in rags, and beg.
Daughter: And I'll whine about a bunch of stuff! Actually, everything.
Son: Please!! Please!!!
Daughter: Waaaaah. Whine!!
After Day 2 back at school:
Me: How was your day?
Son: Great. I love day two. 'Cause on the first day back, you're all "that guy who went to New Zealand." But the next day, you're just a regular guy. You don't need too much attention.