In the classroom....

Professor Phoebe unlocks the classroom door and steps inside. She holds it open for you while you walk in behind her.

"So, are you sure you left it in here? Your desk seems to be clear...." Professor Phoebe says, looking over at your bare desktop and immaculately clean surrounding floor.

"Y-yeah, for sure!" You respond, quickly digging your hand through your bag while behind her, trying to find something to sneakily drop on the floor. No dice, she turns around too quickly.

"Not in there either, huh?" She looks at you digging through your bag. "Well, I could go ask if any of the cleaners picked it up. What exactly did you lose?"

Your hand stops. Ummm.... drat, you should've thought about that earlier during class. Okay, that's fine, just make something up now -- something that'll keep her alone with you in this classroom, instead of going out into the corridors again. Something that'll get her in an easy position to be dirty to really really quickly, before she can stop you.

"Ummm...."

.....This is harder to think of than it looks.