A man has been taken into custody for smashing a security guard in the head with a glass bottle at the Metropolitan Museum of Art – and all because a portrait was hanging crookedly, law enforcement sources said.

Richard Davis, 33, was being grilled by detectives at the Central Park Precinct on Wednesday morning about his alleged attack on a 46-year-old guard inside the famed Upper East Side museum Friday night, the sources said.

Davis had been looking at various pieces of artwork when he stumbled on the crooked canvass — and the guard overheard him muttering his dismay, police said.

When Davis tried to straighten out the piece, the guard told him not to touch it and to complain to the information desk before walking away, cops said.

But a furious Davis produced a bottle and came up behind the guard, smashing him in the back of the head, police said.

Davis then snarled, “Do your job,” and bolted from the museum, police said.

The guard suffered a gash to the head and a cut to the hand, but his injuries were not considered life-threatening.

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