So Juri does find that a little weird; how old is this man? Much older than she is! But she replies with a bemused grin and takes a juice box of her own, grape.

"It's easy! You just take the straw here and poke it in the little hole." She demonstrates. "And then drink!"

Maybe her new roommate's one that hasn't had a lot of fun... If so, she should definitely introduce him to Guilmon. Guilmon can fix any fun deficiency.