use quick comebacks ALL the time. im now famous for it in my class!!!
1.if some one u dont like sez "aww thats only worth a dollar." u say:"well so are you."
2.if someone sez they dont want to be near you, then say:"well thats ur problem."

it really works!!!

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"No, but I will write to your mother." - Hermione Granger
"Lockhart'll sign anything if it stands still long enough." - Ron Weasly