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Union Square in San Francisco, Macy's.
Martin sat at the autograph table, signing a DVD handed to him by a fan, and said with a smile, "Thanks for your support."
The book signing was drawing to a close in the afternoon, and the line of people waiting had thinned out considerably.
A tall and chubby white guy with a Blu-ray collector's edition disc had joined the end of the queue.
When Martin looked up again, he spotted Musk at the end of the line, and wondered what the heck he was doing there.
Soon it was Musk's turn. He handed over the disc to Martin and asked, "Old friend, how about a photo together?"
After signing, and seeing that there was no one else behind, Martin promptly stood up to take a photo with Musk.
The latter held the disc in one hand and opened the camera on his phone with the other, handing it to Bruce and remembering to add, "Make me look handsome and Martin, not so much."
Martin said, "Do as he says."
