A North Side man ambushed a man in a Wrigleyville bathroom Sunday morning, according to police, stabbing him in the neck with a broken beer bottle.

Gregg Greaves, 23, was charged with one felony count of aggravated battery causing great bodily harm. Greaves, who lives on the 4700 block of North Beacon Street, stabbed the man at the Red Ivy Bar at 3525 N. Clark St., Chicago Police said. While it's not confirmed Greaves was in Wrigleyville specifically for the annual bar crawl nicknamed TBOX, the crime occurred during Saturday's Twelve Bars of Christmas pub crawl. It starts at 8 a.m. and continues all day.

According to the report, police were called to the Wrigleyville bar near the corner of Clark and Eddy streets around 12:30 Sunday morning. The 25-year-old victim told police he walked into the men's bathroom when Greaves jumped out of a stall and attacked him with a broken beer bottle. Let Patch save you time. Get more Lake View news like this delivered right to your inbox or smartphone with our free newsletter. Fast signup here.

Greaves stabbed the man in the neck causing serious injuries, police said. The victim pushed Greaves away, only to be cut on the neck again, as well as his chin and hands, according to the report. A 30-year-old bartender walked into the bathroom to find the bloody scene. After being transferred to Advocate Illinois Masonic Medical Center in Lake View, the victim was taken into surgery and is reported to be in stable condition.

Then Greaves defecated into his bare hands and started throwing his fecal matter on the floor in the processing room. And while police confirm Greaves was drunk at the time of the arrest, things took an unusual turn when he was taken back to the 19th District Police Station on Addison Street.

According to the report, Greaves became verbally abusive to officers during processing. He started shouting obscenities and refused to wear his pants in the station.