Snape to the tip of the Astronomy tower by his nose.
92. Blow up Myrtle's toilet.
93. When you are with Myrtle, point at a blank wall and scream "BASILISK!"
94. Ask Voldemort if he would like to get a bright purple mowhawk.
95. Call Proffessor Lupin "Jacob Black."
96. Purposely stomp on Percy Weasley's glasses and then cry, saying his glasses hurt you.
97. Braid Dumbledore's beard.
98. Throw Lemon Drops in Dumbledoe's face.
99. Compliment McGonagall on her "realistic Halloween costume."
100. Organize a break-in in Snape's office.
You know, I still have a bunch of ideas for things not to do at Hogwarts. I think I will have to expand this list to "200 things"