Cuban coffee.
Espresso with so much
sugar in it that you're not sure if you're shivering because of the bitterness, the sweetness, or the rush of
caffeine.
A shot of this stuff can be had for about fifty cents in Little Havana. If you're bringing it back to the office (hint: this is a wonderful social move), order a colada, which is the size of a small fast food coffee and will come with a stack of little plastic cups. That should set you back by about a dollar.
Some people sip café cubano; others swig a shot and chase it with cold water. I prefer to buy a colada for myself and drink it like American coffee. But then I'm a sick puppy.