Bartenders tend to be cool, charismatic people with an ingrained air of stoicism. Naturally, this makes us drawn to them even more than we already are, knowing that they’re the only thing standing in between us and the booze. Unfortunately, not all bartenders are worth getting to know and there are four major types plaguing our favorite watering holes with these offenses:

The One Serving Underage Drinkers

No one really wants to be at a bar with 19-year-olds, but people are also uniformly disapproving of criminals. If these jokers get caught, the bar could be the one footing the tab and for many dive bars, they literally can’t afford to pay the fine. Did we mention that we’re not trying to be at a bar filled with 19-year-olds?

The One Encouraging Binge Drinkers

Not all bartenders are goading alcoholics on, displaying shot records boasting 56 drinks in one night, and being convicted of manslaughter (looking at you, France), but there are plenty who can push another drink on you and sleep well that night. Most barkeeps don’t want to deal with wasted customers, but the bottom of the barrel drink-slingers love running up a tab.

The One That’s Serving You Dirty Glasses

These bartenders are a little more stealthy because we can’t always see exactly what happens behind the bar. They might only be using their bare hands to scoop ice or they could have a relaxed policy about washing glassware and cocktail shakers, but, either way, you’re getting something extra in your drink. Point is, you want to steer clear of any bartender that’s one dirty glass away from a Bar Rescue.

The Ones Ignoring Basic Science

A couple of bartenders were arrested in Washington state a few years ago for performing fire-breathing tricks. They apparently did it for years before local authorities caught on. Sure, there are oodles of shots and desserts that utilize fire for a shock-and-awe effect, but blowing streams of fire into the air while surrounded by alcohol just reeks of a bad idea. Speaking of things going up in smoke, don’t let a bartender convince you to take a shot infused with liquid nitrogen until it’s done smoking. A British woman recently learned this the hard way and perforated her stomach on her 18th birthday. The bottom line is that a good bartender shouldn’t have to act like they’re the offspring of Khaleesi to serve you a solid drink.

Welcome to adulthood?