The foundation of any coffee based drink, ever. The hot, short equivalent of a cold shower.
Espresso can be used as tool to wake a person up in the morning. This is quite a useful function for any workplace, it can turn your employees from mumbling, bleary eyed drones into fast working busy bee drones, which is useful if work is to be done.
Any person who doesn't like coffee or is 'caffiene-free' is a useless hippy, who will never amount to a thing in this mad, dog eat dog world, so drink up.
The tell tale signs of a quality espresso is always the crema (the yellow-ish residue on top of the dark liquid'. No crema=no espresso.
There are many pretencious ways of ordering your espresso dressed up with a little milk, if you're a complete idiotic pisstain, order your half-fat, mocha-cino, low foam latte from Starbucks, you pathetic sheep.
I recommend Starbucks Gingerbread latte by the way.