Sure, it’s been around since biblical times, but suddenly the shofar is trending among Bay Area billionaires.

Well, O.K., only two leading tech C.E.O.s of our time have revealed that they are quite skilled in the most analog of instruments. Still! Their mothers must be so proud.

On Sept. 10, the 34-year-old founder of Facebook posted there a video of himself tooting his own ram’s horn in the comfort of his home in Palo Alto, Calif. “Mark Zuckerberg is celebrating Rosh Hashana,” read the status update, complete with an apple-and-honey emoji.

He huffed and puffed an impressive tekiah-teruah-shevarim: a series of staccato blasts followed by a longer high note, as per tradition. Unintentionally adding an extra fillip: his 1-year-old daughter, August, wailing offscreen.