Metallica's James Hetfield Secretly Attends Mastodon Performance in Halloween Mask

9gag During Mastodon ‘s set at the Portugal’s Rock in Lisboa Festival last month, there was one crowd member who stuck out from the rest. Fully geared up with Metallica merch and a Halloween mask over his face, the crowd member attended the rocking musical evening while swaying to Mastodon’s beat. However, due to closer inspection from fans, the masked fan was reportedly none other than Metallica frontman James Hetfield

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Metallica's James Hetfield Secretly Attends Mastodon Performance in Halloween Mask