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I've seen: 5 limpers to the button, who limps, bb raises, button pushes with AA... I don't know if he picked up a huge tell or something. BB was short-stacked.

Anyways, it happens. That was in a live 5-5 NL game.

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Oh, there's your reason. He probably "had a feeling" since he was sipping his "lucky drink" that night. Its not uncommon to see a seemingly good player try a fancypants move like this, and its ridiculous how many seemingly good live players are actually complete morons about some very basic things.