Metallica's James Hetfield wanted to see Mastodon perform recently at Rock in Rio(Lisbon) where Metallica was headlining. But instead of watching like a VIP side stage the metal frontman decided to join the pit front row in disguise.
Here is a fan account sent to the folks over at MetalSucks:
"So, during Mastodon at Rock in Rio, into the snake pit comes a guy fully dressed in Metallica apparel, hoodie over the head, gloves in hands (with that heat!) and a mask. I was “ok, seen weirder stuff” and continue to Rock on. But a friend of mine grabbed me and said: "That’s James!" And it really was him. Made some eye contact with him a few times, it really were his blue eyes. Also, the way he was rocking out, full of his mannerisms.
"To add everything up, there was a security guy (not from the venue’s security) at the entrance of the pit, ALWAYS looking at him. To top it off, Jeff came in and snapped a few pictures of him. James was right behind me.
"Most of the people in the pit didn’t noticed it, but the ones around him did. Nobody made a fuss about it, we let the man Rock out, but we KNEW, and he knew we we’re on to him. In fact, he elbowed this friend of mine twice in a row, despite the fact she was not too close to him. Elbowed her once, she didn’t care, elbowed her twice, she looks back and he’s all relaxed, just watching the show… ;) He wanted us to notice him.
"A few songs later, he walks out and a venue security grabs him; the other security guy that came with him talked with him. We couldn’t hear of course, but we later went to the venue security and asked him “Hey, was that James?” and his reply? “Yeah, he is in Metallica."