The Pet Snake

A sister went to her brother's room and says,

"I'm scared, can I sleep with you?"

"Yes, sis."

"What is this?" (pointing at his dick)

"My pet snake."

"Can I pet it?"

"Yes."

He wakes up in a hospital.

"What happened?"

"Your snake spit on me, so I bit his head off."

"You dummy!"

"Whaaat?"