Want to know what's new and hot in the sweets world? Just head to "Omohara," the district where the youth fashion of Harajuku intersects with the high-end consumer culture of Omotesando. You can spot the trends from a block away: Just look for the lines.

For the last three years, the longest have been those outside pancake restaurants. Hawaiian specialist Eggs 'n Things led the way, with queues snaking down the street and around the corner. It was briefly ousted from the top spot, in terms of waiting time, when Ben & Jerry's opened in spring 2012.

Now there's a new hit item on the block that is racking up waits of over two hours. The object of such fierce desire? Popcorn.