(@Nia: lol, your responses are great!)
"Whoa. Cool! Free collectibles! And ooh, I wonder what country these coins are from? And wow, I wonder if a really notable someone wore this crown?..." (I'm a pack rat that likes cool things.)
WWYDI you noticed that your map of the world had tiny little pictures that moved?
(Haha!)
Stay in my room as much as possible, sticking a chair under the doorknob so Eustace couldn't get in, and read and write and go on TLC and... (unless we're talking post-VDT).
WWYDI you saw a tall, skinny man wearing a steepled hat?
Wonder if he was a Marshwiggle.
WWYDI you fell off the edge of a castle tower (think Ed in PC movie)?
Laugh. Loudly.
WWYDI you saw a map just like Caspian's magic one?
Scream.
WWYDI your sister (if you don't have one, pretend) was being chased by a bear?
Run even though it's futile.
WWYDI someone simply appeared?
Freak out.
WWYDI you saw a Narnian man who didn't speak at a dinner party with 6 other friends?
Try to talk to him?
WWYDI you woke up after falling asleep on Aslan's breath?
Be deafened, I guess.
WWYDI Aslan let you touch his mane?