When Christopher Taft's sister made him a penis-shaped birthday cake on Sunday, it was supposed to be a joke.
What happened next is no laughing matter: Taft allegedly shot her in the buttocks, according to the Florida Sun-Sentinel.
The incident happened at Taft's home in Holly Hill, Florida, at a party honoring his 21st birthday.
When Taft's sister brought out the sex organ-shaped cake, he thought it was a funny prank. However, he allegedly thought one good turn deserved another.
So Taft allegedly shot the sister in the buttocks with a BB gun, but never intended to hurt her, ClickOrlando.com reports.
However, the BB shot from Taft's gun got embedded in his sister's skin, requiring her to go to a local hospital, according to the New York Daily News.
The sister, whose name and age have not been released, called the cops on Taft, who was arrested on aggravated battery and battery, according to the Daily Mail.
Taft's sister declined to press charges, but he was taken to the Volusia County Jail anyway. He has since been released.
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