Required Phrase: "I nearly peed myself laughing"

"Just take it, Crabbe!" I ordered. "When did you start questioning my orders anyway?"

"I don't know, Malfoy," Crabbe said in his soft grunt of a voice. "You didn't tell me what this potion would do-"

"Drink the dang potion!" I yelled. Time spent arguing is time wasted when you work for the Dark Lord.

He gave me a nervous glance, then downed the potion. My thickset minion with the pudding-bowl haircut morphed into… a first year Hufflepuff girl.

I nearly peed myself laughing, or rather, trying not to laugh at the confused "girl" in front of me.

Maybe this mission had perks after all.