Updated

A man shocked the breakfast crowd at a Queens McDonald’s Tuesday when he strolled in with a knife stuck in his back while chatting on a cellphone.

Andrew Hardy, 53, his shirt drenched in blood, appeared remarkably composed as he paced about the Jamaica restaurant at around 10 a.m., witnesses said.

“He was cool and calm. But you could tell he was shaken up,” said Hardy’s pal, Michel Green, 43, of Jamaica. “I went to pull the knife out, but someone said, ‘No, no! It might have hit an artery!’ ”

Another customer said Hardy seemed to be saying his final goodbyes on his cellphone.

Hardy was knifed a few minutes earlier when he tried to break up a mob of men hurling glass bottles at each other on Sutphin Boulevard near 91st Street, sources said. The brawl was just two blocks from the busy Jamaica Station commuter hub, which was bustling with Long Island Rail Road, subway and AirTrain riders.

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