I completely don't understand that kind of humor. The episode Steve Wozniak describes in iWoz, playing pranks with the remote control a few decades ago, OK, it was weird and sort of interesting, although I am also glad that I was not the victim of his joke. But to copy that kind of thing now, I really don't get it. At least Wozniak built his own remote control.
Sorry to rant about it, but it seems to me to be the same mentality as the script kiddies, it's just plain annoying and making the lifes of everybody else harder.
Stating the obvious, because apparently it isn't for everybody. It's funny when nobody actually gets hurt. Many people were "hurt" here. The presenters for delivering sub-par presentations, and the viewers for suffering sub-par presentations. Company image and customer satisfaction suffer. All because of one person's doing. Not a very justifiable action even on the basis of humor.
(not saying it's wrong to think it's funny, but it's likely that the net utility from that prank is negative)
I don't think anyone (over 13) would find it funny if they went around unplugging the TVs, what is the difference between that and achieving the same result with an off-the-shelf remote?