I consider this to be a subject that I am well aware of, being a Barnes & Noble Cafe customer. I come, sit at a table (preferably one next to an outlet), do my work, and people watch. Through my procrastination & people watching, I have come to learn a few things about the cafe customers. Most can fall into certain categories, to which I have made up. 
Category 1: The Creepy Guy Next Door
Everyone knows this guy. The one that sits, with no book/computer, and stares…at everyone! They look normal, but nope, totally creepy. My advice, sit as far away as possible & out of the stare zone.
Category 2: The Creepy Guy Next Door, Part 2
Same as above, but this creepster has a book & pretends to read.
Category 3: The Retired Guy
This customer is the same as the creepy guy, just not creepy! He is generally a sweet looking older man who has nothing to do but come to Barnes & Noble and waste time. He will generally try and spark up a conversation. Topic of choice: past wars he fought in
Category 4: The High Schooler
They have no purpose but to annoy those around them with loud & pointless phone calls about high school drama “Seriously, she said WHAT?!!?” They will also have a hot chocolate in hand to look cool and make people think they are drinking coffee.
Category 5: The Wedding Planner
Ohhh they are everywhere! Always meeting clients (the Bride) to discuss flowers, colors, how to tame unruly groomsmen, and to gossip about other couples.
Category 6: The Blind Date
These people are very easy to spot. One person arrives early & gets their coffee & a magazine and sits waiting nervously. Then when their blind date shows up (IF they show up), it leads to an awkward “hello, nice to meet you” introduction and the guy getting nervous, hitting the table & coffee goes everywhere.
Category 7: College Students
This is a category I am far too familiar with. They always look stressed, impatient & can be bitchy when bothered. And if you are sitting at a table next to an outlet WITHOUT a computer, you better move because the stink eye look can kill. Students can easily be picked out by the computer, venti coffee, and messed up hair/clothing.
Category 8: The Church Ladies
Really, does this need an explanation?
Category 9: Business Men
Always in a rush, always loud, and always dressed to the 9s. Ready to make a deal?
Category 10: Everyone else.
So how did I do? I know there are categories I left out, so please feel free to submit your Barnes & Noble stories. The same categories apply to Starbucks customers!
Enough procrastination for today…I’m off to move to a nearby table with an outlet now that Creepy Guy has moved!
