An attendant of bar attached to a TASMAC-run liquor shop near Vellakovil was arrested for stabbing a customer with a beer bottle in a brawl on Friday. Nallasamy (58), a farmer of Kulalipalayam with his friends went to a TASMAC bar at Mettukoundan Valasu on Thursday. He was stabbed following a quarrel broke out between him and the bar attender Palanisamy over buying liquor.