A 26 year-old man went on a drunken rampage with a knife in Guangzhou’s Baiyun District February 21, causing injuries to twelve people, Guangzhou Daily reports. The cause of his rage? A minor disagreement with staff at a mobile phone store, according to media reports.

The man, surnamed Lang from Yunnan Province, stabbed two members of staff at a mobile phone shop on Junhe Street after getting into a disagreement at arround 10:20 p.m. One member of staff, Chen Bin, was left bleeding from the chest. Another, Mo Jingbin, had a large gash on his right leg.

Lang then took a motorbike taxi to near Luogang Village Administrative Building. When the driver of the taxi asked him to pay up he stabbed the driver, leaving him with chest injuries. Lang then stabbed several bystanders.

At around 10:50 p.m. he went to sample some of the local street barbecue. After being confronted for not paying up, he attacked the owner of the stall and even the owner’s 2 year-old daughter, leaving the infant with chest injuries.

None of the victims are in a critical condition and Lang is now in police custody.

At this point, we can only speculate as to what was the cause of all this rage. Was it the frustrations that come with being a migrant in Guangzhou? Was it fear of becoming a male version of one of China’s much-maligned left-over women? Or maybe there is something in the air?