The show started with Lemmy ranting against those who throw things at them ... he said he would leave the stage if anything was thrown at him that evening.
We only had to wait about 4 or 5 songs and it happened, part way through the intro to Metropolis they just stopped and walked off {didn't actually see what was thrown}. However they weren't gone very long and at least I got to hear the intro to one of my favourite songs twice!
Here is a little video clip of the moment (click on the link to start it):
Me:
Venue
The supplies arrive:
Some trucks for the guy who wanted some truck photos