Jitters.

I'm not sure what Dunkin' (née Dunkin' Donuts) is trying to do here, but I think it's a bad idea. 

Dunkin' Spiked is the latest spinoff product from America's favorite coffee place (they endure Starbucks but they like Dunkin'), and this tower of caffeinated power was in the local supermarket. The iced tea seems like an okay idea, along the lines of Twisted Tea, with the same amount of alcohol by volume, 5% -- identical to lousy commercial beers like Budweiser. But the iced coffee concerned me. What's the caffeine in that? Can you drink a six-pack without getting the jitters? You're not supposed to get the jitters until the morning after. 

The iced coffee is 6% ABV, just a tetch higher than Bud, but each can contains about 30 mg caffeine, compared to 100 mg in a cup of coffee, per Delish (whose reviewer was not impressed with the product). Therefore, if you drank a whole six of Dunkin' Spiked Iced Coffee, you'd get 20 mg less than the caffeine in two cups of coffee. That would probably help you stay up and drink more, but it's not like taking amphetamines or snorting coke. 

For another comparison, think of the cocktails made with energy drinks like Red Bull that have become popular in the last couple of decades. A typical cocktail might have two ounces of vodka and the rest of the 12-ounce glass filled with Red Bull. That results in a single drink with:

1) 6.6% alcohol by volume; 

2) 93 mg caffeine; 

3) Lousy flavor because Red Bull tastes like a petroleum product. 

So, more potent in every way. 

To each his own, but I'd prefer to keep using coffee as God intended -- as a means of waking up and staying awake through life's more boring moments. I have no intention of counteracting that gift with alcohol, but your mileage may vary. Just make sure you get a designated driver for that mileage!