Snape: Perhaps Potter and his friends were simply in the wrong place at the wrong time. However, the circumstances are suspicious. I, for one, don't recall seeing Potter at dinner.
Gilderoy Lockhart: I'm afraid that's my doing, Severus. You see, Harry was helping me answer my fan mail.
Hermione: That's why Ron and I went looking for him, Professor. We'd just found him when Harry said...
Snape: (raising an eyebrow) Yes, Miss Granger?
Harry: When I said I wasn't hungry. We were heading back to the Common Room and found Mrs. Norris.
Dumbledore: Innocent until proven guilty.
Filch: My cat has been petrified! I want to see some punishment!
*Suspicious: If you are suspicious of someone or something, you do not trust them, and are careful when dealing with them.
*Innocent: If someone is innocent, they did not commit a crime which they have been accused of.
*Guilty: If you feel guilty, you feel unhappy because you think that you have done something wrong or have failed to do something which you should have done.
*Petrified: A petrified plant or animal has died and has gradually turned into stone.