Metallica is a rock band that is always rockin' -- even if it's not on stage and no one is playing any instruments.
A new video from TMZ shows the band jamming to "Enter Sandman" in a Gelson's supermarket. Also present: Billy Eichner and a very enthusiastic deli counter employee who takes the mic for a delightful vocal solo midway through the song.
Here's hoping this becomes a regular concert series.
