A teenage girl knocked an unidentified 63-year-old woman to the floor of the 14-Mission bus last night at around 5:50 p.m., according to the Chronicle.

The teenage girl, somewhere around 14 to 18, got onboard the bus at Persia Avenue and Mission Street according to police, and for reasons unknown, shoved the 63-year-old until she fell, kicking her about the face and head.

The victim was taken by to the hospital by paramedics and is expected to recover from her injuries. No suspected perpetrator has been identified or arrested, but Muni is providing video to the investigation.

This for the record, is a far cry from proper bus etiquette.