Maniac: (Noun) A person exhibiting extreme symptoms of wild behavior, esp. when violent and dangerous.

Amy Winehouse, who has been "resting" in St. Lucia for the past few months, finally got on a plane headed for London this weekend, presumably to deal with her impending divorce from her estranged husband Blake. And I know you're all going to be just absolutely shocked by what happened next -- but, spoiler alert! -- Amy wreaked unholy havoc upon her fellow passengers.

Our source in the Club World section of BA2152 said the relative quiet on-board was shattered when Amy appeared from First Class, shouting incoherently and running up and down the aisles.

The source said: 'I was pretty shocked to look up and see Amy Winehouse hurtling through the plane and shouting. It’s just not what you expect.'

The source continued: 'She had clearly been drinking and kept running between the different classes, which just isn’t what people do on planes. (Source)

Not what you'd expect? Running around and shouting incoherently is pretty much the only thing I expect from Amy Winehouse. She doesn't live her life by the credo "What Would Tasmanian Devil Do?" for nothing, you know.

More of Wino at the airport, reunited with her beehive 'o crazy: