It has always baffled me that there was any confusion that the scene was anything other than deliberately goofy. I mean, the laugh alone is ridiculously absurd when all other laughing in the game sounds much more genuine. They're making silly poses when they do it. Yuna says "you probably shouldn't laugh anymore" with an embarrassed look on her face. Wakka says "we thought you guys might have gone crazy." The rest of them party gives them looks like "are you retarded?"

A couple of months ago it was confirmed that the scene was indeed based on a silly acting exercise that Kazushige Nojima once did.

Alexander O. Smith Interview | RPG Site


I hope if this is a remake then there is more clarification that yes this is a couple of seventeen year olds being silly silly teenagers. Though I don't know how considering it is very obvious already. Otherwise I hope it's unchanged, aside from maybe more accurate lip movements.