Unbeknownst to Lisa, someone had been watching her the whole time. They knew about the perfect boyfriend/girlfriend formula she had bought, and now they were ready to make their move, running up to Lisa and bumped into her.
"Hey, watch it!" Lisa yelled, turning to her hand to see a bottle of chocolate milk in place of the formula.
They mystery student looked at their prize with glee, until Lisa called out with "HEY! GET BACK HERE WITH MY STUFF!"
They saw the girl running after them and ran as fast as they could, shoving passing people behind them to slow Lisa down. Lisa saw them make a turn for the Music Room, which made sense since it was empty in the morning.
Lisa took a short cut, bolting through the twin side doors of the chemistry lab and taking two rights. The thief was busy unlocking the door and running in. Lisa knew only five people besides the teacher who had that key.
"Give it up right now!..." Lisa yelled as she bursted through the door and saw the thief. It was....