Petunia was a bag of flour assigned to Claire and Jim in their heath class about parenting.
Petunia was a brown bag wearing a diper. She had an a drawn on black face with two eyes, and black hair with colored pins like her mother.
During health class, bags of flour were assigned to groups of two. Claire and Jim were paired up and they seemed to be happy together as flour parents. Claire seemed to be more protective over Petunia than Jim. She scolded Jim for not giving their "daughter" a helmet while on his vespa and when Petunia was blown up, she was mildly heartbroken.
- Petunia did not die in vain, she was the key to finding the gruesome's weak spot.