On the company's testimonials page of its website, customers describe feeling like 'Superman' after drinking a cup of Death Wish.
'I’d say one cup of this is comparable to about 5 shots of espresso,' Diedrick Nagle wrote. 'I felt like Superman on steroids. Welp, off to save the world folks!'
Fancier drinks - think lattes and frappucinos - contain less coffee, and therefore have less caffeine than a plain, black cup.
A Starbucks latte, for example, has half the caffeine (about 9.4 milligrams per fluid ounce) of the company's brewed coffee.