This list may contain spoilers!
1. Relate everything they say to the Harry Potter books and/or movies.
2. Say they look like a Harry Potter character of the opposite gender.
3. Quote Dobby.
4. Hog the computer 24/7 while logged onto MuggleNet.
5. Read out loud to them whenever they can't get away from you (Example: When in a car or an elevator). If you don't have a book with you, recite from memory.
6. Give them Harry Potter merchandise for their birthday and Christmas and demand that they keep it and treasure it forever.
7. Rewrite their favorite song with Harry Potter lyrics and sing it constantly....
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