Required Phrase: "Mmm, tasty"

Michael Corner was an idiot, but as a result of Ginny's most recent break-up, George, the big brother, had to do something to her ex-boyfriend.

As the target took his seat in the Great Hall, George levitated a small pile of powder into Corner's goblet. The boy soon filled the goblet with chocolate milk, of which he took a large swig.

"Mmm, tasty," Corner remarked loudly.

A moment later, Corner was overcome with an unusual urge. He sprinted toward Professor McGonagall and began loudly declaring his undying love for the woman.

George nodded happily. The newest love potion was a hit.