Just dropping in to (re)emphasize the fact that the advice in this thread given by Ant, repentance, etc. is pure gold. I've never started a business (and have never felt particularly inclined to do so), but the information in this thread is both fascinating and invaluable. And, as others have said, it's not the sort of advice that people usually give out for free, especially to people with such ramshackle business "plans."

I did work as an assistant manager at a retail store for several years, though, and I can confirm that customers are, indeed, sociopaths. We didn't have a public bathroom, and customers would often get huffy when we told them to release their bowels elsewhere. Sometimes, they'd even seek revenge. I can't tell you how many times I had to pick up pissed-on shirts from the back corner of the store, and on multiple occasions, we found turds wadded up in clothing, with other pieces of clothing used as butt-wipes. And yes, theft was endemic as well.

E: I should maybe add that sometimes, customers would just barge into the back room and try to sneak/force themselves into the bathroom. There was a lot of stuff laying around back there, especially on the weekends (it was a donation-driven thrift store, and Sat. was the big day for both shoppers and donations). In retrospect, I'm kind of surprised that a customer making a b-line to the bathroom never tripped on something, broke their back, and sued the fuck out of us. All they'd have to claim in court was that we were negligent in our duty to prevent customers from accessing the back room. (Added to this, of course, is the possibility to get customers like this: http://www.liveleak.com/view?i=5ef_1346645520 ).

Since this was a thrift store, it's possible that we had more sociopathic customers than average (lots of poor, nutty people). But to reiterate what others have said, with this being a hookah bar in a college town, you're going to attract all sorts of people who have a taste for alcohol and more intensely mind-altering drugs, and you can be damn sure that some of them are going to go apeshit and damage either your property or themselves.