I visited Summerfest three times so far this year, and each time, I noticed that fewer people were drinking from a stack of beer cups. In fact, on Monday night, at the raging Matisyahu concert, I didn't see a single soul slurping beer from a stack.

Is cup stacking out?

In case you don't know what I'm talking about: In the past, lots of party-hardy Summerfest-goers stacked their empty beer cups, keeping the full one on top, to show off the number of brews they've already consumed.

Cup staking became a part of the Big Gig's culture (there's even a cup stacking T-shirt for sale) like Venice Club's fried eggplant or that ubiquitous Ecuadorian band or getting spit on when walking beneath the Sky Glider. (Yes, this happened to me once. Luckily the loogie landed on my shoe.)

Maybe the next couple of days – since it's a holiday and all – will generate more cup stacking. I hope so. Even though I myself was never a stacker of the beer cup, I miss seeing it.