SW4 organisers Lock & Loaded are offering revellers the chance to win a day out at London's best electronic dance festival.
The lucky winner and a friend will receive two VIP tickets to the festival's near-sold-out Sunday date, with a drinks rider and complimentary accommodation a stone's throw from the festival site.
To enter, drop them a line with the answer to the following question:
How many artist names appear in the new SW4 trailer?
Hint: the video's available to view at SW4's official website.
Entries should be submitted to firstname.lastname@example.org with 'Skrillex' in the subject line. The competition closes at midday on Friday 10th August.