When your luck's out, it really is out.
This game is done and dusted now, just a matter of how many Arsenal will get.
Alexis Sanchez wriggles clear in the box and his cross is headed away by Allan Nyom, straight to Hector Bellerin. The Spaniard takes it first time and his strike comes off Ben Watson and loops over Heurelho Gomes into the net.
It's cruel on Watford, but Arsenal won't mind.