You can't make this stuff up! According to Mark Angeles at philly.com:

Fan from hell creates a stir at Cher concert
Woman adds unexpected mayhem to show

"I've Got You, Babe" took on new meaning at Monday night's Cher concert when a 400-pound, intoxicated, foul-mouthed female fan refused to vacate a seat and had to be forcibly removed.

The unidentified woman, who witnesses said was dressed in a cowboy hat, tank top and jeans, caused another fan to be injured after female security guards from the First Union Center ejected the corpulent cowgirl.

The drama began soon after the end of the opening act, which featured singer Cyndi Lauper.

"She kept on yelling 'I love you Cyndi' and was drinking out of a flask," said one concertgoer who requested anonymity.

...

"In the meantime, Cher is singing 'I've Got You Babe,' the noise is incredible, it's dark, they're shining a flashlight at her and she looks to be cursing pretty good," said another concertgoer.

See the article for the rest of the wierdness, but the subtitle makes me wonder: what mayhem did they expect?