Ask them if Cedric Diggory is a vampire.
Tell them movie Lupin looks like a giant rodent.
Ask if Jacob Black is a long lost American Relative of the Black Family
Speak in an American Accent
Tell them Robert Pattinson got more famous as Edward and Cedric was just one film.
Read the books (or remember) in places like lifts
Ask them if Avada Kedavra really turns people into vampires. So Dumbledore, James, Lily, ect. are?
Tell them 11 ways to use Harry Potter to annoy a Twilight fan has vanished from Mugglenet.
Tell them Harry Potter was also called a fad tons of toys, games and costumes.
Tell them the name of the first Harry Potter book and film was changed in America where Twilight came from but no titles of the Twilight books where changed in Britain where Harry Potter came from.
Tell them the Harry Potter books got changed to American English but in Britain the Twilight books stayed as American English.
Say Harry Potter also has many haters like some Lord of The Rings and Narnia fans.
Laugh that their book has been tried to be sued by the authors of books about another type of Muggles and the worst witch.
Remember when religious people called Harry Potter evil, then laugh.
Tell them that they are really a muggle.

i think that this should be more appropriately titled: "How a Twilight-obsessed Tryhard can bait and troll Harry Potter-obsessed Pot-tards to seemingly ill effect"

i can't stand Twilight, but I have no idea what any of that Harry Potter nonsense is either, so was left very non-annoyed and genuinely disappointed by this whole experience.