"Come on... you can't figure that one out?" Tidus, you're one of the few people on the train that should be able to! Reno looked vaguely disappointed for two seconds before he revealed the answer in a quick shot. "Pack chocobo! You're now a pac'obo; a pack chocobo!"

He giggled at his own joke. The word was common on his world, but maybe the slang hadn't reached others even with chocobos. Their loss. He found it amusing at least to call Tidus that.