Katy Fritz goes around in circles in an insane discussion with the driver of an MBTA bus she wanted to take to Southie from the Back Bay tonight.

MBTA Transit Police report arresting a man for allegedly masturbating on a 28 bus as it traveled between Dudley and Ruggles Friday afternoon.

According to a police report, Donnie McLean, 46, snuck on the rear of the bus at Dudley, sat near a woman, put his hands in his pants and "began to motion it up and down in a stroking manner." The woman said she got up and moved toward the front of the bus. McLean, she said, followed her, sat across from her and started up again, only this time he made sure to unzip his pants and turn to face her so she could get a full view.

At Ruggles, she fled the bus and found a couple of transit cops, one of whom reported McLean's pants were unzipped when he started talking to him about the incident.

McLean was charged with open and gross lewdness.

Innocent, etc.

An argument on a 44 bus on Humboldt Avenue this morning ended in a fatal knife fight, according to the MBTA and the Boston Globe.

The Herald reports police are looking for four people who fled the bus.

Officials from the MBTA and the MetroWest Regional Transit Authority will gather tomorrow to announce you'll be able to use CharlieCards on MWRTA buses.

The formal announcement is at 11:30 a.m. at the Woodland stop on the Green Line.

Nathan Spencer and Rory Razon report the amazing sight this morning. Razon adds:

The most obnoxious thing about people that park at bus stops in Brighton Center is that there is a TON of legal on street parking available. If money is the issue with ticketing more often, deputize me and I'll do it for free.

The Globe reports riders of the 28 in Mattapan love the new, larger buses the T has put on the route but that people in Grove Hall are, um, disquieted by the buses. The Globe doesn't cite any specific complaints about the specific new vehicles in Grove Hall, but seems to indicate that City Councilor Chuck Turner wanted the buses pulled off the roads after one month because of the legacy of 30 years of the T treating the neighborhood like dirt.

Channel 4 reports Roland Carr, 51, was arrested on a charge of domestic assault and battery on a child after a witness saw him punch his seven-year-old son this afternoon. AlertNewEngland reports the two were on a 16 bus at the time.

The Roxbury 16-year-old, not named because of his age, was ordered locked up in lieu of bail for a Tuesday-afternoon knife attack on another rider on a 23 bus at Ruggles and Tremont streets, the Suffolk County District Attorney's office says.

Even if the kid can raise the money, he'll remain behind bars because Boston Juvenile Court Judge Paul Lewis reovked his bail on outstanding drug and assault cases, according to the DA's office.

Channel 7 tweets a man was stabbed several times around 6:30 p.m. on a bus on Tremont Street at Ruggles Street - a photo the station posted shows the bus stopped in front of Boston Police headquarters. The victim is expected to survive.