When high school senior Siobhan O'Dell got rejected from Duke University, she sent the school a letter back saying she could not accept their rejection.

Though the letter is meant to be lighthearted, O'Dell told ABC the idea came from some real emotions she and her classmates had gone through while applying to colleges.

"Seniors labor over their applications, stress over waiting, and sometimes even cry over the answer," she said. "It made me realize how much power these universities have over us. Their word is final and absolute."

That's why she decided to write back.

O'Dell sent Duke a letter that read, "I am unable to accept your refusal to offer me admission."

The letter mimics language used in college rejection letters. O'Dell explains she has seen rejection letters from "the best and brightest universities in the country."

Because of this, she joked she would have to attend Duke in the fall. She sent the letter to the admissions office.

Her letter was shared over 100,000 times on Tumblr.

O'Dell said the attention has been mostly positive, and is glad her letter made people laugh. She will attend the University of South Carolina next fall.

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