Dave Grohl was the special guest during Wet Leg‘s Friday (April 21st) Coachella set. While performing “Ur Mum,” Grohl snuck on stage and joined the band for their “longest and loudest scream.”

Rhian Teasdale told the crowd, “OK Coachella Weekend Two, we’ve all been practicing our longest and loudest scream. Are you all ready? Here we go.” Teasdale launched a countdown to scream and then suddenly, Grohl appeared at the mic to help with the shout a thon.