1. Ask him if he is wearing new clothing.
2. Call him "Weasel."
3. Sing the Slytherin version of "Weasley is our King" in the Great Hall at dinner time. Don't forget the sonorous charm.
4. Tell him that Great Aunt Muriel is moving into the Burrow for an indefinite period of time.
5. Sing Pop Goes the Weasel in his presence.
6. Tell him that he is terrible at Quidditch.
7. Ask him why his face and hair are the same color.
8. Ask him why his mother married Arthur Weasley, she could have done so much better for herself.
9. Ask him if he knew that Ginny was dating Draco Malfoy.
10. Ask him how long his affair with Madame Rosmerta has been going on.
I'm planning on publishing Tonks's list in a couple of hours!