Working at a bar or a club can earn you some good money. Unfortunately, dealing with drunk people, cover charges, and entitled drunk people can get annoying. It's the price you have to pay for some pretty sweet untaxed money.
I used to work as a bouncer/doorman at a bar that charged a $2 cover on weekend nights. Everyone paid to get in, with only one exception, party buses. We agreed with the different party bus operators that if they brought their groups to our bar, they would get in for free. (lively crowds are good for business)
So one night, I'm working, and a guy comes in with his girlfriend, and I tell him it's two bucks a head. He grumbles about it, and I give him the same line I tell anyone who complains: 'A $2 cover is the cheapest thing you will buy here tonight. You might want to go elsewhere if you can't afford it.' He doesn't want to look cheap in front of his lady, so he pays.