You were in Potions class, following the professor's instructions carefully to make sure you didn't mess anything up. Measuring things exactly and weighing them correctly.

Tom, however, was being careless. He wasn't measuring his ingredients and just putting them in his cauldron without a care.

Accidentally, some of his potion ended up in yours, which made it foam over and explode, getting you both detention.

"Great job, idiot..." Tom muttered under his breath, despite it being his fault.