They also guard doorways to celebrity parties. In those rich guy parties, bouncers are controlled by a wienie-boy butler who talks in a squeaky voice, but commands all the power as long as the big guys are getting paid. These types of rich guy bouncers are less round and more built, and can easily throw you out of a bulletproof window, but can't overturn cars.
"I gave the bouncer at the door a fifty and he let me and my friends in right away, without cover charge too!"
"that bouncer saved my ass from getting jumped, I'm gonna buy him some drinks for after he gets off work"
Most Bouncers or Doormen are actually lacking in brain cells, and only got through life by being big and "hard" (able to beat someone up without much harm to themselves). Sometimes the Bouncer or Doorman will willingly abuse their position and actually throw someone out who is neither too drunk, nor causing any trouble, simply for the sake of it. I assume it's because they just need to look they're actually doing something, and not just standing around talking.
If the person resists, they will force them out. They generally dislike people who actually have some pride and attack them with words and intelligence rather than fists.
They generally live by their own rules, and ignore the law. If a bouncer beats up a person he has thrown out because he has been resisting, even if the person had a right to resist, the Bouncer will not be charged with assault, and the person he beat up will spend the night in jail.
Bouncer: You're too drunk, get out.
The guy: What? I'm fine...
Bouncer: No you're not, you're coming with me.
The bouncer grabs the guy by the arms
The guy: What are you doing? Let go of me.
The guy shrugs the Bouncers hands off. The Bouncer then takes that as an excuse to grab him harder and push him out the door.
The next hour consists of the guy arguing with bouncer over, whilst getting more and more pissed off. Until the guy realises there's no point and goes home, thinking to return the next day to complain. Except even if he did complain nothing would happen, and the Bouncer would just lie and say the guy was kicking off BEFORE he was grabbed.
Ben: No idea, I showed him my ID and I hadn't been drinking. they're all unreasonable pricks with IQ's below 10.
Ben: Wow, what a nob, I can't think of any bouncer I've encountered that hasn't been a complete dickhead, unlucky mate.