"If you went to the headmaster, and asked him for something or to do something for you, and he knew you had no manners, didn't greet him in class..." she said looking at Evelyn then to the rest of them, "or just didn't ask with a please... He would never do anything for you." She said looking at the children's faces... were they understanding? "If you didn't show him the respect you need to show him, he wouldn't entertain helping you."
She ran her fingers through her hair, "Do you understand? Manners are important to a Slytherin because they get. You. What. You. Want." She said and paused for effect. "If you truly are ambitious, you will use everything you have to further yourself. Manners are indeed a sign of respect. Use that to get what you want." She told them.
"Now... the Meeting part of this is over... lets get to the fun." She said and tapped the floor with her wand. The rug pulled up and a hatch was in the middle. She opened the hatch and within it was... ice. She put her wand to the ice and it began melting, fast. After a few moments she removed the wand. "This is a scuba hatch. You can drop in
here and travel under the lake. You cannot resurface on the outside, the lake is charmed that way so we cannot leave the castle, and intruders cannot come in. You may encounter a mermaid, beware of jelly fish, and grindylow.
I will be underwater with you, so nothing will happen to you." She said and then with her wand opened a truck that had been behind her. "Self fitting wetsuits, all green and silver. Put them on and they will shrink or enlarge to fit your body type. Those of you who are old enough to know the bubblehead charm, be my guest, you younger lot..." she opened the jar and took out some of the slimey green stuff, "Gillyweed."