"Well " Sarah began, "it's a horrible disease! First you get a huge gut, then after a day or so other things start happening to you, random stuff that nobody can predict!"
"What-"
"And it's contagious!! And I just gave it to you!"
"What crap!"
"You don't have to believe me," Sarah smirked as she got up to leave, "pretty soon you'll see the results yourself! Happy birthday, twerp!"
"You cow," Freddie shook his head. "You just made that all up! You fat, lying cow!"
"Then how do you explain my belly?" Sarah grinned evilly. To a younger sibling Freddie's age, her logic was impeccable.
"Nuh-uh! I still don't believe you," he tried to sound convincing, but he couldn't deny the fact that his sister had grown a pot belly overnight and he felt his argument fall apart.
Sarah left him be and returned to her bedroom. She grabbed her cellphone and brought up the simplistic Mutantext message. If she sent it to him now, he would likely assume she was just mocking him in writing. He probably wouldn't figure the text message as the cause of his transformation, at least not the first few times. Why would he? It was impossible and made no sense!
Sarah forwarded the message to her brother and lay back on her bed, stroking her belly and waiting to hear his screams