A while back, I posted here to report that a random video started playing while I was looking at MN on my phone (Nokia Lumia). It happened twice, without me pressing or clicking anything. It was the insurance advert with the seagull and the statue.
Now it's happening again! Also happened twice, this time a news report about Christmas being cancelled because the elves are on strike. Presumably an advert, but my phone was on silent so I couldn't hear what the reporter was saying. Again, I had not pressed or clicked on anything. The video started spontaneously when I was reading a thread.