Raptus Regaliter

I've got a Mac at work.  An iMac.  It keeps making noises at me.  Noises which sound like "bonk".  I do not know what this means.  I've looked at the Finder.  Nothing.  I've looked at the launch bar thingy at the bottom, and nothing's turned green or started going bouncy-bouncy.

I am, therefore, somewhat puzzled.

Meanwhile, September 11th.  No, not THAT September 11th, and definitely not bringing that house down.  I refer to Sept. 11th just gone, Hollywood's Comedy Night at Bonn, which was a far better experience than at the Alter Wartesaal.  And apparently better-lit, when you look at the videos.