After using the lint roller, Adi stepped into the classroom only to be greeted by a squeaky sound. Huh? What was that? Looking around, he spotted Professor Airey with a balloon. Source of squeakiness located.

Folding his arms pretty close to him to protect himself from the cold, Adi trudged towards the man. "Hi, Professor. Hope you're having fun.'' He grinned before bustling off to find a seat. Oh looky. They got their own balloons.