[Addressing your colleagues at a staff meeting] "I can tell you where they've been sourcing their ingredients... my storeroom. These drug-dealing fiends that we are investigating have been ransacking my classroom for supplies. I am outraged. When I get my hands on those delinquents, I'll make them rue the day they were born." 

"Why are you snooping around in my classroom, Miss Granger?" 

"At this rate, we're never going to find out who's cooking meth in the school. This is why I hate children. We should just consider every single non-Slytherin student guilty until proven otherwise."