Take a look at the pattern and magnitude of FB injuries (two graphs). Probably way too many old farts doing something dumb.
http://www.marketwatch.com/story/the-number-one-reason-people-go-to-the-er-2016-02-15
http://www.marketwatch.com/story/the-number-one-reason-people-go-to-the-er-2016-02-15