Mark Zuckerberg’s vision for AI-powered smart glasses hit an embarrassing snag Wednesday when his flagship product demonstration crashed and burned during Meta’s biggest event of the year.

The CEO connected food content creator Jack Mancuso via livestream to showcase the newly upgraded Ray-Ban Meta glasses’ cooking assistance features at the Meta Connect event, according to Business Insider. Mancuso asked the $800 voice-controlled glasses to guide him through mixing a “Korean-inspired steak sauce” for his steak sandwich.

The AI completely botched the request. Rather than providing step-by-step instructions, it jumped straight to telling Mancuso he should use soy sauce and sesame oil, then insisted he had “already combined the base ingredients” when he hadn’t touched anything. (RELATED: Zuckerberg Signs 20-Year Deal To Build Nuclear-Fueled AI)

“You’ve already combined the base ingredients, so now grate the pear and gently combine it with the base sauce,” the AI said, ignoring Mancuso’s multiple attempts to clarify what he should do first.

Mancuso blamed “messed up” WiFi and handed control back to Zuckerberg, who tried to save face. “The irony of the whole thing is that you spend years making technology and then the WiFi at the day catches you,” Zuckerberg said.

The cooking disaster wasn’t the only failure. Shortly after, Zuckerberg’s demonstration of the new Meta Ray-Ban Display glasses with neural wristband controls also collapsed when he couldn’t answer incoming video calls from Meta Chief Technology Officer Andrew Bosworth, the outlet reported.

“This WiFi is brutal,” Bosworth said after rushing onstage to salvage the presentation. “I promise you no one is more upset about this than I am, because this is my team that now has to go debug why this didn’t work on the stage.”

Despite the technical meltdowns, Meta shares gained half a percentage point following the demonstrations, according to Business Insider.