Gabriel was obviously out sick the day that Steve Bould was going over the offside trap.
The Arsenal centre-half had a nightmare as he attempted to come out alongside Per Mertesacker, Mathieu Debuchy and Nacho Monreal.
Robert Lewandowski couldn't believe his luck as he simply broke the trap and nodded the ball beyond Petr Cech to give Bayern Munich a deserved lead against Arsenal at the Allianz Arena.
Kids, this is how not to defend a cross.
