I had a similarly irritating experience with one of the CCC videos, but I'm not sure if it's just me being spoiled (these are otherwise excellent quality talks, provided at no cost to me). The first 20 minutes of the Snowden/family talk was a presenter fiddling around with her laptop which had run out of battery, interspersed with a guy whistling into the mic to "entertain" the crowd. I was able to skip past it, but whistling - wtf!?