I remember once at a Metallica gig at O2 Arena in 2008: frontman James Hetfield pausing to tell everyone in the immediate crowd to “put your fuckin’ cameras and phones away, and just enjoy the show ok?”. (Kate Bush was yesterday the latest artist to make the same request, in much politer words).
James was of course addressing the usuals focused on the tiny screens of their devices, impeding the live experience for the sake of some jerky low-res footage. (To be fair, I’ve done the same but years ago and only a couple of times, for never-played-before tracks).
If I were a member of the Google Glass advertising team I might suggest something like this live bollocking as a decent ad opener, then while the offenders sheepishly lower their phones (as they did in real life) we pan sideways to a smiling metalhead casually recording it all unnoticed through the small prism fixed over his eyeball, his hands free to throw a devil’s horn or lift aloft his plastic beer receptacle as the next number roars into life.