Amy Winehouse was back in full force at Nelson Mandela’s 90th birthday concert Friday night, but her Glastonbury performance the following day didn’t go quite as swimmingly. When Amy left the stage for the pit during a rendition of “Rehab,” she somehow ended up in a fistfight with a member of the audience. There are several theories as to the impetus behind the attack, including (via The Daily Mail ):

[1.] Crowd members claimed the singer lashed out in response to a derogatory comment about her husband Blake Fielder-Civil, after she spent much of the show making slurring references to ‘my Blakey’.

[2.] Her publicist said she had reacted instinctively when someone tried to pull her trademark beehive hairdo.

[3.] Festival organiser Michael Eavis’s version of events was that the man had made a grab at Miss Winehouse’s breasts.

Or 4) Amy Winehouse is fucking insane. Ding ding ding ding! She actually started off the concert by spitting her gum into the audience, berating their manners when they booed her precious Blake, and later singing “I’m not opening for a cunt like Kanye.”* She’s like the Patches O’Houlihan of live performing. You half expect her to belt out, “Is it ‘necessary’ to punch my fans in the face? Is it necessary for me to drink my own urine? No, but I do it anyway because it’s sterile and I like the taste!” before pelting the audience with a sackful of wrenches.

*Kanye West, presumably — video after the jump.

At Mandela’s birthday:

Glastonbury:

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Amy Winehouse chose to go shopping for booze instead of showing up for the photocall for the Nelson Mandela concert in which she’s slated to perform tonight. According to the Daily Mail

Despite spending an hour-and-a-half in rehearsals for the Mandela concert [two days earlier], Winehouse was a no-show on Thursday. Instead she visited her husband Blake Fielder-Civil at London’s Pentonville Prison, before stopping off for some Jack Daniels and vodka and a packet of sweets.

Maybe the booze and the candy were an apology gift for her guaranteed-to-be shambolic performance tonight. Always one step ahead, that Amy!

Despite being diagnosed with early stage emphysema, Amy Winehouse still plans to perform at Nelson Mandela’s 90th birthday in London’s Hyde Park. The Mirror says

[During the performance,] a special ambulance crew will be on permanent standby backstage. Amy’s [dressing room] will include a private hospital suite with a massage bed and paramedics.

Amy added that she was serious about regaining optimal lung health, even going as far as to begin a strict cigarette regiment the moment she stepped out of the hospital. Other plans for rehabilitation include huffing kerosene through an asbestos filter and freebasing asphalt sealant, commonly reffered to by pulmonary specialists as the “Fast Track to Lung Success.”