A (Kauai) Hawaii farmer has named a baby yak JACK after the calf’s mum attacked JACK BLACK while she was pregnant.

The funnyman was shooting new film Tropic Thunder on Kauai when he approached the mum-to-be on a hike.

Co-star Brandon T. Jackson recalls, “We were going down a steep hill and then a yak, who was very pregnant and named Bertha, threw him 10 feet in the air.

“The next day Bertha had a 12-pound baby and the owner named it Baby Jack.”

(Source: Contactmusic.com)