There is a folky truism that bad news comes in threes. I'm sure there is someone who's written about this. In a lot of fairy tales the number three pops up. For example, there were the Three Bears who came back and found Goldilocks. There were a lot of groups of threes in that story. I think the maiden got three chances to guess Rumplestillskin's name, and the genie generally gave three wishes to the finder of the magic lamp.
I guess the human mind wants to find structure in unrelated things, so when two celebrities die people are on edge waiting for the next one to die. Sometimes you'll have four celebrities die, so then you find people trying to divide up the four into threes. For ex, there were three actors, a group of three, and one former athlete, who belongs in another group of three, the totality of which has not yet been revealed.
I was thinking about this when two airplane crashes occurred over the last week or so. There was the one in South America, and there was the one in Greece. People have been trying to connect these two air disasters to the Spanish helicopter crash in Afghanistan, but a helicopter crash isn't an airplane crash, and the crash is in a war zone and may have been shot down by the Taliban, so technically it doesn't fit with your regular air crash. Plus, there was another helicopter crash in Afghanistan a few weeks earlier under similar circumstances, so then you would be up to four, and, well, bad news comes in threes.
So I figured unless you count the plane that skidded off the runway up in Canada a few weeks back, the world was due another plane crash soon.
Now the news comes that there was another crash, this one an emergency landing in Peru where over three dozen people died and maybe twice that number survived. A spokesman for the airline said, "The plane did not crash. It did not fall. The plane made an emergency landing." This clarification would seem to eliminate it as a plane crash for counting purposes.