Rocker Slash joined hip-hop heroes Cypress Hill onstage in Hollywood on Saturday night.
The guitarist was an unannounced special guest for the group at The Troubadour, where Cypress Hill hosted their 20th anniversary concert.
Tweeting about the experience after the show, Slash wrote, "Great getting up with Cypress Hill. Good people, the whole organization. Survived 20 years together in this crazy biz."