Fights break out inside the stadium, foul language can be heard in the stands, and there are obscene gestures everywhere.

A day at the ballpark is supposed to be a family-friendly experience, but INSIDE EDITION found that's not always the case.  

At ballparks around the country, INSIDE EDITION found that while most fans are well-behaved, some are just out of control.  And when it comes to fans being rude and obnoxious, there's one thing that always seems to make it worse: the free flow of alcohol.

That's just what INSIDE EDITION found when the Chicago Cubs came to Milwaukee's Miller Park to take on the Brewers.   

Until recently, ballparks mostly sold beer, but now it is possible to find hard liquor all around the stadium, in the form of mixed drinks and shots.
 
With billion dollar ballparks and multi-million dollar player contracts, Major League Baseball relies on alcohol sales.  Revenues are estimated to be as much as $300 million a year.
      
But there are dangers when so much alcohol is involved.  At Miller Park, INSIDE EDITION saw fans fighting on the stadium floor.  They were all taken away in handcuffs.  On Opening Day alone, there were 24 citations given and 25 people ejected from the park. 

INSIDE EDITION saw one fan nearly passed out by the fifth inning and others just staggering around the stadium barely able to walk.
 
In one incident, witnesses say a Cubs fan was punched and kicked in the head by a rival Brewers fan after the game.

At most of the newer ballparks, like Miller Park in Milwaukee, there are full-service restaurants and bars that overlook the field.  While patrons are only allowed to buy two alcoholic drinks at a time and beer sales in the stadium are cut off after the 7th inning, INSIDE EDITION found that those rules don't seem to apply at the bars.
 
INSIDE EDITION producers watched one man buy four alcoholic drinks, including a Jaegerbomb, at a time and saw other people buy alcohol well past the 7th inning.  

But what may seem like harmless fun can turn serious.

Paul Robinson of Seattle was severely injured when he says a drunken fan fell on top of him in Yankee Stadium in 2007. 

Ellen Massey needed two back surgeries and says she's still in pain after being injured at the Mets ballpark that same season.  Steve Kaufman represents both Robinson and Massey.

"These gigantic people, they weigh 250 to 300 pounds, slam into their back like an unguided missile.  They're taken to the hospital.  They both have major injuries," says Kaufman.

At the brand-new Yankee Stadium, a pre-game announcement encourages people to visit a stadium bar.  And for the first time in nine years, the stadium is serving beer in the notoriously rowdy bleachers, at up to $10 per beer.

And it is no surprise that fans who might not want to pay the high prices find a way to sneak in their own alcohol.
 
Major League ballparks do take security very seriously and don't tolerate rowdy behavior.  Fans that get out of line are quickly ejected, but INSIDE EDITION found that lately, the police have their hands full.

No one from Major League Baseball would be interviewed for this report.  Both the Yankees and Mets had no comment about the claims by people who say they were injured by drunken fans at their parks.