Heads were spinning when Alice Cooper — the rocker who was accused in 1969 of killing a chicken onstage and slurping its blood — arrived at Kutsher’s Tribeca for chicken liver on Passover.

Cooper sauntered into the haute Jewish eatery with his original manager Shep Gordon, the showbiz legend and subject of Mike Myers’ Tribeca Film Festival doc “Supermensch: The Legend of Shep Gordon.”

“It was so great to see people’s faces on Passover when Alice walked in,” enthused Gordon, whom Michael Douglas describes as “a JewBu,” a Jewish Buddhist.

The food was such a hit, Kutsher’s is catering a Saturday party for Myers’ directorial effort that’s already getting early Oscars buzz.

Cooper’s also celebrating a doc at the fest, “Super Duper Alice Cooper.”