The Gunners have developed a reputation for unforced errors, something which has cost them dearly under Unai Emery.
Yesterday, it was Sokratis Papastathopoulos at fault, with the Greek defender gifting the ball to the Hornets inside his own box before Tom Cleverley converted to begin the comeback.
David Luiz then conceded his second penalty in four Arsenal appearances with a clumsy tackle on Roberto Pereyra.
It’s no wonder Pierre-Emerick Aubameyang, whose double put the Gunners two goals ahead, is sick and tired of the lacklustre performances from those behind him.