1. Eat all his green apples.
2. Replace all his green apples with red ones.
3. Replace his wardrobe with red and gold, specifically ones with the Gryffindoor emblem, articles of clothing.
4. Redecorate his room to have a Gryffindoor theme.
5. Rave on and on about how amazing Harry Potter is.
6. Rave on and on about Google.
7. Ask him if he wants to go to Pigfarts.
8. Hide his wand.
9. Rave on and on about Voldemort and his task.
10. Pester him about how he wasn't able to become a friend of Harry's.
11. Ask about his past crush on Hermione Granger.
12. Ask him if he ever had a crush on Neville.
13. Make him go on a date with Pansy.
14. Buy him a pet ferret.
15. Transfigure him into a ferret.
16. Buy him a pet weasel.
17. Pester him about having Snape as a godfather.
18. Ask him what his boggart is.
19. Ask why he uses his father as a threat.
20. Dye his hair red and follow him around, calling him a Weasley.
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How To Annoy Harry Potter Characters
RandomTitle says it all! This is a very un-original thing for me to do. If you have a book like this and I use the same idea, I'm sorry! It's probably a coincidence!